The teaser isn't consistent with what we've previously seen (or would see afterwards), since Greg has been otherwise shown wearing underwear to bed. Plus, when Anthony Clark takes his pants off behind the counter, you can plainly see he is wearing underwear.
Kim: Sammy! Don't take that, that's Logan's!
Christine: It's okay. At least he didn't hit him in the head like yesterday.
Kim: He hit him in the head?
Kim: I'm sorry. Is he okay?
Christine: Oh no, he was fine. He gets his head from Jimmy's side of the family.
Billy: It's Boy's Sport Club. We were planning on watching women's volleyball, but the gym teacher caught us and threw us out.
Greg: You invited people to watch? Jimmy, this is a learning experience, not Baby Fight Club.
Kim: What the hell is going on?!
(she breaks up the fight and lifts up Sammy)
Christine: Slow down. Don't everyone say something stupid at once.
Greg: How much does he weigh?
Jimmy: About 45. I put him on the scale in the farmer's market.
Jimmy: Don't worry, he had a full diaper.
Greg: No, thanks, but I'd rather take advice from a real doctor than from a person who calls his nipples "funny bunnies."
Jimmy: Damn Christine and her big mouth.
Shauna Duggins is credited as playing Linda. On screen, however, her character is called Elizabeth Waters.
Mike Malin, better known as "Boogie" the rapping white boy bartender from Big Brother 2, landed this role just days after he was evicted from that game show on August 2, 2001. Guess sometimes it pays not to win. A brief bit from the making of "Baby Fight Club" was featured in the episode of Big Brother 2 that aired on September 18, 2001. CBS promos that aired around the same time had Greg and Jimmy begging to be let into the Big Brother house to get away from their wives. Two seasons later, in "Big Brother-in-Law," both of them do get in.