In the final shot of the episode you can see the Sensei laughing at what is happening.
When Dwight enters the bathroom to find his desk, you can see the rarely-seen cameraman in the mirror reflection.
The closeup of Dwight's business card shows Dunder Mifflin's phone number to be in the 717 area code. While Scranton used to be in the 717 area code, NE Pennsylvania was shifted into a new 570 area code in December, 1998.
We learn that Jim's emergency contact is named Larissa Halpert. Her address is 117 Vonbergen Street.
On the dojo poster, "10 Rules of Karate" are:
1. Obey Your Parents
2. No Junk Food
3. Do Your Homework
4. Keep Your Room Clean
5. Maintain an Indomitable Spirit
6. Don't Fight with Your Siblings
7. Practice, Practice, Practice
8. Treat Others the Way That You Would Like to Be Treated
9. Be Loyal to Your Country
10. HAVE FUN!!!
This prop had to be cut out of the episode for time, but was revealed in B.J. Novak's TVGuide.com blog.
Michael: Pam, I hate to break this to you, but Dwight can't stop you from being mugged. He's just not tough enough.
Pam: He's a purple belt, that's really high.
Michael: Oh, God, I could beat up Dwight, that's ridiculous. I can murder him.
Kelly: (practicing karate with Dwight) HI YAH! Hey that was pretty close!
Dwight: Good, now let me take you from behind.
Dwight: (showing his purple belt) This is not a toy, this is a message to the entire office so that everyone can see I can physically dominate them.
Michael: Well, that would be kinda worthless because I know a ton of 14-year-old girls who can kick his ass.
Jim: You know a ton of 14-year-old girls?
Dwight: What belt are they?
Dwight: I come from a long line of fighters. My maternal grandfather was the toughest guy I ever knew…World War II veteran. My father battled blood pressure and obesity. Different kind of fight.
Michael: Go ahead, punch me.
Jim: (Joking) Can't. Just got a manicure.
Michael: Oh, queer... eye. Queer Eye. That's a good show—important show.
Michael: (Prank-calling Ryan, imitating Michael Jackson) Hey Ryan, this is Michael Jackson, calling from Wonderland.
Ryan: You mean Neverland?
Jim: Sounds tough. (Snapping fingers) But when you're a jet, you're a jet all the way.
Michael: (To Pam) Shelax! Stop Pam-M-S-ing.
Pam: (About the day where Michael has to sign many papers) I call it the Perfect Storm.
Pam: Michael tends to procrastinate whenever he has to do work.
Michael: (Singing) I don't wanna work, I just wanna bang on this mug all day!
Michael: (About the paperwork) Okay, so let's gangbang this and go home!
Michael: My emergency contact is Todd Packer. Todd F. Packer. Know what the 'F' stands for?
Dwight: I am now Senpai, which is Assistant Sensei.
Jim: Assistant to the Sensei. That's pretty cool.
Dwight: Assistant Sensei.
Dwight I need to change my emergency contact information from Michael Scott.
Ryan: Ok, to what?
Dwight Just put...The...Hospital. Contact number...just put 911.
Michael: He is such a sore loser.
Michael: I could beat up Dwight. That's ridiculous. I can murder him.
(Dwight enters Michael's office)
Michael: Oh hey, Karate Kid...the Hilary Swank version. Hi. How are you?
Michael: Look. Dwight is a wuss. When we rented Armageddon, he cried at the end of it.
Dwight: Michael, I told you. That was because it was New Year's Eve, and it started to snow at exactly midnight.
Michael: I've beat up black belts.
Jim: How'd you know they were black belts?
Michael: They told me. After.
Michael: Would I rather be feared or loved? Um, easy. Both. I want people to be afraid of how much they love me.
Oscar: Michael, can't your conversation wait until Monday?
Toby: We want to go home…
Michael: Yeah, well you don't even have anyone to go home to, Toby.
The German episode title is "Kampflustig", meaning "Funny Fight". The French title is "Le Combat", and the Spanish title is "La pelea", both exact translations. The Italian title is "Guerrieri d'ufficio", meaning "Office Warriors".
In the episode, when Dwight punches Michael, Michael screams "fahhhhhhh." Earlier that morning, on a local radio morning talk show (Kidd Kraddick in the Morning- Kiddlive.com), one of the DJs reveals that he had been trying to get the "fahhhhh" as a new public catchphrase.
Dwight's sensei is played by Lance Krall, who is himself a second degree black belt, and sixth in his weight class in the United States.
While filming the fight, the friction in Wilson's protective piece of wraparound headgear cut his face.
Rainn Wilson has previous karate experience, and actually is a yellow belt.
Michael's statement that, "There would be two punches: me punching you and you hitting the floor" is a misquote from The Breakfast Club. The original statement made by Emilio Estevez's character, was "Two hits: me hitting you and you hitting the floor."
Michael posits, "Would I rather be feared or loved? Um, easy. Both. I want people to be afraid of how much they love me." This is a reference to the Renaissance philosopher Machiavelli, who wrote The Prince, in which he describes how princes should rule their lands. One of the more famous pieces of advice he gave was to be feared, rather than loved, by your people.
Michael's line, "You talkin' to me? You talkin' to me? Raging Bull—Al Pacino" is actually from Robert de Niro in Taxi Driver.
There are several indirect references to West Side Story, a musical, in this episode, including Jim's statement that "when you're a jet, you're a jet all the way," from the song "Jet Song," and Jim's finger-snapping during the confrontation between Dwight and Michael.
While holding Dwight in a headlock, Michael yells, "You are the weakest link!" in reference to The Weakest Link, a game show that spawned the catch phrase. The quote, always announced by the eerie Anne Robinson, which ran from 2001 to 2004 in the United States, dismissed the contestants who were voted off of the show.
While Dwight is searching for his missing desk, you can clearly see that Ryan has a Myspace.com inbox open on his laptop. This may be B.J. Novak's actual MySpace blog, since news has leaked that many of the actors, like Rainn Wilson, Jenna Fischer, and B.J. Novak update their blogs while cameras are rolling.
After the fight, Michael refers to Dwight as The Karate Kid - the Hilary Swank version. This refers to the last of The Karate Kid movies, where the main character is played by Hilary Swank. More recently, Swank starred as another brave fighter in 2004's Million Dollar Baby.
When Michael is in his office with Ryan, he sings to the tune of "Bang the Drum All Day" by Todd Rundgren.
Kevin says, "Sweep the Leg," the same thing that the Cobra-Kai Sensei says in The Karate Kid.
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