In the Cat Court sketch, the judge calls the case "Garfield vs. Heathcliff." However, Heathcliff is listed on screen as the plaintiff, and enters court first, as happens on People's Court. In a court of law, cases are named using the format of "plaintiff vs. defendant." So, he should have said "Heathcliff vs. Garfield."
Teacher: What's going on here?
All desks are surrounding Lil' Hitler while U.S.A. is sitting on the outside in his own desk.
U.S.A.: Pssh. It's not my problem.
Japan comes out of nowhere and knocks U.S.A.s food off his desk and runs away.
U.S.A.: Now...it's my problem.
Teacher: Now class...
Lil' Hitler: My teacher? I will need the Czechoslovakian boys desk as well.
Teacher: Lil' Hitler where's Lil' Poloski?
Lil' Poloski is gone and all is left is his food on his desk
Lil' Hitler: My Teacher?
Teacher: Yes, Lil' Hitler.
Lil' Hitler: My desk is small. I need this Polish boys desk also.
Teacher: Everyone gets the same size desk Lil' Hitler.
Lil' Hitler crosses his arms and shakes his head in disagreement
Garfield (to Heathcliff): I'm gonna start calling you Monday, because I hate Mondays!
Professor X: Welcome recruits. Though we've had to lower our standards thanks to a shortage of actual mutants, the dangers you'll face are no less real. You'll be defending a world that hates and fears you!
Recruit: What?! Hate and fear us because we're mutants?
Professor X: No, because you were in the Police Academy movies.
The Stoop!d Monkey is about to stick his finger up a light bulb socket.
Don't Cross the streams!
The channel flip featuring two men at restroom urinals is a spoof of the Ghostbusters movies. In the movies, they couldn't cross the "streams" from their Proton Packs, because that would negate the streams from catching the ghost.
While the two men are not specifically identified, the costumes they wear are similar to the main characters of the films, proton packs included.
New X-Men: Police Academy
The last sketch of this episode featured the five main cast members from the Police Academy movies and Professor X, leader of the X-Men. The X-men featured in the beginning of the sketch were based on the X-men team that first appeared in Giant-Size X-Men #1 from the comics, replacing Thunderbird with Beast.
The costumes that Professor X gave the recruits are based on the costumes from the X-Men movies. Hightower's look is based on Storm's first costume, which can also be seen in Giant-Size X-Men #1.
The enemy in the sketch is based on the Sentinel from the X-men cartoons and comics.
Garfield vs. Heathcliff
The sketch featuring the court case between the two cartoon kittens parodies the characters from their respective comic strips.
"Time for timer!"
The yellow blob that appears at the end of the Heathcliff vs. Garfield sketch is Timer. Timer was a character that promoted healthy eating for kids watching ABC on Saturday mornings in short spots during commercial breaks. He first appeared in one of the ABC Afterschool Specials, The Incredible, Indelible, Magical, Physical Mystery Trip in 1973.
The lil Hitler shorts are a reference to the events of world war 2.