Mojovision - S2-E11
Deliberate mistake: Some of the footage of the X-Men in action that Major Domo shows Mojo is clips from previous episodes, and even clips from the show's opening theme. (00:03:36 - 00:04:22)
Deliberate mistake: When Gambit and Pierre are boating down the river, in the shot of Pierre saying "Yeah, we got word," the trees they pass on either side of the screen are just the same tree drawn repeatedly. (00:08:08)
'Til Death Do Us Part: Part 1 - S2-E1
Deliberate mistake: When the Friends of Humanity are secretly filming their fight with Beast, Wolverine and Gambit, their cameraman is shown to be filming from the street behind a post box. However, the footage that they submitted to the news is merely the same camera angles shown from the viewer's perspective of the show. (00:11:45 - 00:13:20)