Girl Trouble / School Dance - S3-E18
Continuity mistake: Besides the fact that when Helga is sharpening her pencil, the desk arrangement changes, one of the students visible when she looks at Arnold is...Helga.
Darkness and Light: Part 1 - S1-E11
Plot hole: When Hulk and Banner have been physically separated by the nutrient bath, they are both wearing tattered pants. Given that Hulk and Banner were previously occupying the same body, this should not be possible. Hulk was the one that went into the nutrient bath, so if Banner's body was separated from Hulk, then Banner should be naked.
Suggested correction: It was done deliberately as a form of censorship. They didn't want to show Bruce's genitals.
Explaining why the mistake occurred doesn't invalidate it. Unless you're suggesting the nutrient bath also was able to duplicate the pants.
I am not. I am just explaining the reason behind this error.
Do you have a source for this explanation? If not, I would call it conjecture and while it doesn't invalidate the mistake, it does change it to a deliberate mistake if true.
You realise a character can be drawn naked without actually showing their genitals (and/or breasts in the case of women), right? The Little Mermaid is a good example of this.
Continuity mistake: The six Rangers are standing together as Wolfbane is enlarged by Orbis. Kat and Tanya change places when switching from the wide shot, to a closeup of the Rangers.
Monkey Fun - S2-E13
Other mistake: Season 2 episode 13 "Monkey Fun": Just before the enlarged Titano appears at the zoo, there is a family watching normal-sized monkeys in a cage. The family father (farthest on the right) has a drawing disorder with his eyes: their pupils look up and down, respectively, giving him a rather goofy expression.