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
Starring: Kenan Thompson, Ken Foree, Dan Frischman, Kel Mitchell, Teal Marchande, Vanessa Baden
Visible crew/equipment: When Kel gets up to get more water you can see one of the cameras.
Kenan: Who loves orange soda?
Kel Kimble: K-K-Kel loves orange soda.
Kenan: Is it true? Is it truuuue?
Kel Kimble: Mmmhhmmm! I do, I do, I do-oooh.
Two Heads Are Better Than None - S4-E14
Question: Who screams the second time when Kenan tries to question Kel about the first scream?
Answer: Kel.