I've been a huge Tiny Toons fan, and I can tell a lot of season 1 episodes have animation errors. I can think of one instance where I saw multiple Hamtons...
Also, do shows known for animation errors count when the creators of abridged series make fun of them?
Like, for example, this scene from episode 43 of Yu-Gi-Oh Abridged:
"Since Marik entered the tournament, shouldn't he be disqualified?"
"The only person who should be disqualified is whoever made Tristan black in this shot!"
And then we cut to a scene with an animation error, where it looks like Tristan is black.
"Don't you be hatin' on my blackface, playa!"
And a scene from episode 34, where Kaiba's nose is off-model:
"Look at the size of that nose! It's like the animators didn't care!"