Season 4: Episode "Michelangelo Toy's Around."
 

Has anyone ever noticed at the 15 minute, 30 seconds mark in that episode (The part where Michelangelo and the boy are in the closet) when the boy jumps out and says "When my father hears what you're doing, he'll fire the both of ya!" Right after that part michelangelo turns into Raphael twice, the first part he wears Red like Raphael, then after that he has Sai's instead of Nunchucks. I tried looking for the episode but couldn't find it, but if you have access to the episode you may check it out. It's kind of funny. It's Season 4, and the episode is "Michelangelo Toys Around".

That'd be amusing... if similar huge mistakes didn't happen every other episode.

Oh, sorry. I didn't realize mistakes were made that often. Any other amusing ones to look out for?

I remember that, but animation errors wasn't that uncommen in the ot series, what annoyed me more about the ep was mikey chickening out over two regular dudes.

Funny episode
 

But it's a funny episode.

huh? At one point did this happen?

One thing that always cracked me up about this episode is how everyone kept calling Wilbur Weazell "Weasel". And eventually he would say "How many times do I have to keep telling people? IT'S WEAZELL!!!!!!!!" That was always hilarious.