Mistakes
In the episode when there is a rat in the store, there is a scene where Kenan and Kel are discussing the rat. There is a lady in the background holding a green shopping basket. Then in a following shot the same lady is now suddenly holding a red basket. Cut to the shot where she runs out of the store screaming, and suddenly her basket is green again. See more...
Movie Mistakes blog
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Kenan & Kel (1996) - 2 with pictures
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Screenshots of mistakes that have been online for less than a year are only visible to members, but the rest are available to everyone. Don't forget to check out the picture of the day, updated daily, and the top 30 screenshots too.