Revealing mistake: A little oversight on the part of the producers. At the final scores that we are shown, Amy has $10,000, TJ has $9,800, and Travis has $2,400. This all adds up to $22,200. Even if they only answered $400 questions (which we can see that they don't), that's about 55 questions at best, only in the first half. That would run way longer, probably about three or four times as long, as any normal game show. And there's no mention of any other rules regarding the scores so there's no reason to think that there are bonus questions that could raise it that much.
Smart Guy (1997)
1 revealing mistake in A Little Knowledge - chronological order
Starring: Essence Atkins, Tahj Mowry, Omar Gooding, Jason Weaver, John Marshall Jones
Continuity mistake: When TJ records his messages for when his dad comes up to talk, he says "You're right, I just need to sleep on it". When Marcus plays the tape, TJ's voice says "You're right dad, I just need to sleep on it".
TJ Henderson: I'll try to be more sensitive to the fact that you're dumber than me.
Marcus: That's all I ask.
Trivia: John Marshall Jones, who plays Yvette's father, Floyd Henderson, is only ten years older than Essence Atkins.
Question: How come no one believes TJ that he was the one who threw the party, not Marcus?
Answer: It's reckless and irresponsible and it's not something that he does normally. But, it is something that Marcus would do.