The montage of the escalating charitable deeds and destruction of the Pre-Teen Braves and the Cavalry Kids is set to Coven's "One Tin Soldier," made famous in the film Billy Jack (1971).
When everyone was singing "O Canada" they sang, "The true North strong and free, O Canada we stand on guard for thee." The correct words are, "The true North strong and free, from far and wide, O Canada we stand on guard for thee."
When the Cavalry Kids attack the pre-teen braves at the Isotope game, Bart isn't wearing a cap in the first shot, but just 2 seconds later when Milhouse attacks him, he is... Just an animation error...
When Ralph is carried off by the wolf, all the trees that were there 2 seconds earlier are gone.
Chief Wiggum: Well, well, well! Looks like a couple of punks are going to be taking the "Last Train to Clarksville"!
Officer Lou: That's the Monkees, Chief.
Chief Wiggum: Go wait in the car.
Officer Lou: Fine... it was The Monkees.
Ned Flanders: Well, the folks at the Senior Center sure will love that peach tree we planted.
Rod Flanders: I wish we could see their happy faces!
Ned Flanders: Sin of pride, Roddy.
Rod Flanders: I'm sorry.
Ned Flanders: Sin of regret.
Milhouse: I'm bored!
Bart: Hey, I've got an idea - let's tie a string around a fly.
Milhouse: Cool! Do you think bugs feel pain?
Bart: If they don't, I've wasted a lot of my life.
TV Announcer: Next on Comedy Central, an all-new South Park!
Milhouse: I hear those kids' voices are done by grown-ups.
Bart: Hey, there's nothing wrong with that. I just wonder how they keep it so fresh after 43 episodes.
The Pre-Teen Braves: (Dressed as the Calvary Kids.) Oh say can you see,
Back in row double-z,
That the team sucks out loud,
And you fans are all plowed.
Chief Wiggum: (over bullhorn) Okay, home invaders, we don't want to hurt you! We just want to talk!
Officer Lou: Well, if you just wanna talk, why don't we talk about Eddie sleepin' with my ex-wife?
Chief Wiggum: I thought the divorce was final.
Officer Lou: When is a divorce ever final?
Chief Wiggum: Yeah, all right. Let's just move in.
I am Homer, tribal chief.
I am wearing tiny briefs.
Braves teach values boys should know,
Now extended drum solo!
Todd Flanders: Daddy, I'm scared!
Ned Flanders: Scared of what? All the funny camp songs we're gonna sing? (singing, to the tune of "She'll Be Comin' 'Round the Mountain")
We'll be safe inside our fortress when they come.
We'll be safe from creeps and killers when they come.
Unless they have a blow-torch
Or a poison gas injector,
Then I don't know what'll happen when they come!
Bart: The fly's stuck in Flanders' house!
Milhouse: I-I'll go contact the nearest adult!
Bart: There's no time. We're going in!
(Bart climbs in the Flanders' kitchen window. Milhouse follows, dropping something on the ground outside.)
Milhouse: My eyeglass repair kit!
Bart: (pulling him back) Let it go.
Bart (After drinking a 40 year-old novelty Beatles soda): Yellow matter custard, dripping from a dead dog's eye.
Milhouse: Well, Bart, we've learned that war is not the answer.
Bart: Except to all of America's problems.
Willy: Oh, lassie dry your tears.
Otto: Then show us your boobs!
Ralph: (after being thrown through window) I'm a brick.
(Ralph meets a wolf)
Ralph: Would you be my mommy?
(Wolf picks up Ralph in his teeth)
Ralph: You smell like dead bunnies.
Marge: (Nelson thinks a tree is his father) Aw for God's sakes, I could see why he left.
Marge: Here's some supervised activities we can all do together; Future Veterans of Foreign Wars, The 5-H Club…
Marge: They had to admit homosexuals.
Homer: (throwing treadmill into lake) Hey treadmill, how do you like this incline!
Bart: Please don't call our parents.
Chief Wiggum: I'm afraid I have to for hijinks like these. Heh. "Hijinks." It's a funny word. Three dotted letters in a row.
Officer Eddie: Is it hyphenated?
Chief Wiggum: It used to be... back in the old days, you know? Of course, every generation hyphenates the way it wants to. Then there's *NSYNC. Ha! What the hell is that? Jump in anytime, Eddie. These are good topics.
Milhouse: Sometimes I wish a cat would eat me.
Moe: (about to fight Drederick Tatum) Oh, jeez. How did this happen?
The last time Nelson saw his father was in 1997 in "Bart Star"
At the end of the episode when the cast pays tribute to Canada with the singing of O Canada, it refers to Matt Groening's father (also named Homer) who was Canadian. Recently his father's home town of Winnipeg Manitoba named Homer Simpson an honorary citizen, but it caused a bit of controversy when it was argued that Homer Groening was actually from a small town in Saskatchewan.
The two (non-porn) videos you see on the trolley in the Flanders' house are "Girls Gone Mild" and "Debbie Does Penance".
We find out that Lenny's last name is Leonard.
Flanders has a shrine to The Beatles.
After a nod to The Simpsons appeared on South Park in the episode "Simpsons Already Did It". This show returns the compliment.
At the end when the group sings "Oh, Canada", the national anthem of Canada, Marge is waving two flags. One is the Canadian flag, the other is the flag of the Canadian province of Quebec.
Blackboard Joke: Sandwiches should not contain sand.
Couch Gag: The family runs into the living and sits down on the couch; then giant hands reach down and pick them up. The views shifts upwards to reveal the giant hands are that of a giant toddler.
When the boys are selling candies, Nelson says: "Chocolate that melts in your mouth, not in your pants!" This is a play on the famous catchphrase for the M&Ms candies, "Chocolate that melts in your mouth, not in your hands!"
Rolling Stone cover
One of the "visions" Bart has after drinking novelty beverage is Milhouse naked with an Asian woman. This is a reference to the Rolling Stone Magazine cover where a naked John Lennon is embracing Yoko Ono. Incidentally, the picture was taken on the day Lennon was shot, and ran as the Rolling Stone cover on January 22, 1981 as a tribute to Lennon.
When Homer does his Michael Jackson impression, he says, "I own all your songs, losers." This is in reference to Michael Jackson outbidding Paul McCartney for the publishing rights to many of The Beatles songs in 1984, effectively ending their friendship.
When Homer is playing with Ned's bobbleheads, he announces, "Look, I'm Brian Epstein!"
Brian Epstein was the Beatles' manager until the time of his death in 1967. He was very careful with the band's presentation and was an integral part to their early success.
After Homer's "Indian" song describing the point of the Pre-Teen Braves, he goes on to say "Now extended drum solo." The beat of his solo is reminiscent of Ron Bushy's legendary drum solo in Iron Butterfly's trademark song "In-A-Gadda-Da-Vida."
When Homer says "I shall bet no more forever" it is a reference to "I will fight no more forever," which was Nez Perce Chief Joseph's surrender speech to the U.S. Army.
Flander's tapes "Girls Gone Mild" and "Debbie Does Penance" are spoofs of the adult films "Girls Gone Wild" and "Debbie Does Dallas."
Album covers hanging in back of the novelty drinks:
The albums covers that you can see are, from left to right, Magical Mystery Tour, White Album and Let it Be.
Ned Flanders: "... until your boys went Yoko and broke up my collection"
Quote is based on the popular misconception that Yoko Ono broke up the Beatles.
John Lennon, on the cover of a video: "I'm fixing a hole...in my drywall!"
The video cover, complete with John brandishing a hammer and nails, pokes fun at the Beatles' 1967 song "Fixing a Hole," which appeared on their epic "Sgt. Pepper's" album.
Bart: "Yellow matter custard, dripping from a dead dog's eye"
After Bart drinks the 40 year old novelty soda, he quotes the Beatles' song "I Am The Walrus" as he sees Milhouse "morph" through the different phases of the band's career.
TV Announcer: Next on Comedy Central, an all new South Park
Finally The Simpsons makes a parody of South Park. South Park made a parody of The Simpsons in episode 607 - "Simpsons Already Did It." And...like South Park has a few false facts about The Simpsons (like the number of episodes), Bart says "I wonder how they keep it so fresh after 43 episodes." South Park are over 100 episodes.
Ned Flanders: "[The Beatles] Were bigger than Jesus!"
Reference to a comment quoted out of context by John Lennon in 1966.
For more Beatles references/jokes, see the fifth season premiere episode Homer's Barbershop Quartet. Homer also comments that Yoko Ono ruined the Plastic Ono Band in the episode Last Tap Dance in Springfield.
The title refers to Sun Tzu's "The Art of War."