This slip-up takes place during the later episodes of Saved By The Bell with Zack, Slater, Screech, Lisa, and Tori. Jessie and Kelly are gone from the series. Anyway, the plot is that Zack is trying to win tickets to Hawaii from a radio D.J. (Ken Kelly, I believe) who is broadcasting from The Max. But when Zack tries to win the tickets, he is thrown in after school detention. And as he tries to get the rest of the gang to win the tickets, they get thrown in also. Here is where the slip-up takes place. Watch when Screech is thrown in d-hall for talking back to Mr. Belding. He is wearing a blue long-sleeved shirt. Then, a scene or two take place and soon, Lisa and Tori are thrown in d-hall also. But look at Screech now. He has completely changed clothes, and is now wearing a white short sleeved shirt with several other colors and shapes on it.