Revealing mistake: After Kenan gets his head stuck in the bars it becomes obvious on multiple occasions while Kenan is moving around that the "bar" on his right is fairly flexible, presumably made out of rubber for the benefit of the actor.
Kenan & Kel (1996)
1 revealing mistake in Fenced In - chronological order
Starring: Kenan Thompson, Ken Foree, Dan Frischman, Kel Mitchell, Teal Marchande, Vanessa Baden
The Raffle - S3-E3
Factual error: When the Rockmmores turn the new TV on, the resulting light is impossibly bright. (00:06:20)
Kel Kimble: Kenan, I don't touch a tarantula.
Question: How come Roger won't let Kyra help with her Social Studies project?
Answer: He's simply enjoying doing it himself. Especially since he likely believes he can do it better than she can.