One Man's Worth: Part 2 - S4-E2
Continuity mistake: When Fitzroy is draining energy from Xavier in order to create a time portal, he is completely surrounded by Bishop, Storm and Bantam. A few shots later there is no one standing around Fitzroy and Xavier. (00:18:35)
One Man's Worth: Part 2 - S4-E2
Continuity mistake: When the coffee shop owner is caught in Storm's whirlwind, his beard is flesh-colored. (00:03:35)
One Man's Worth: Part 2 - S4-E2
Revealing mistake: Bantam's irises turn completely white for a split-second when he is watching Fitzroy's recording. (00:17:35)
One Man's Worth: Part 2 - S4-E2
Audio problem: Storm's mouth is closed when she says "Fitzroy planted a bomb." (00:02:55)
One Man's Worth: Part 1 - S4-E1
Other mistake: Shard shows Storm and Wolverine surveillance footage of Trevor Fitzroy's deal with Master Mold, stating it was all they could get of their plan before the camera was discovered. However, the footage shows multiple camera angles that a lone mounted surveillance camera could not achieve. (00:11:30 - 00:12:35)
One Man's Worth: Part 1 - S4-E1
Audio problem: The sound of Goliath's footsteps are slightly out of sync with the footsteps themselves. (00:06:30)
One Man's Worth: Part 1 - S4-E1
Audio problem: The theme song during the intro as well as the character's voices for this episode sound like they were recorded at a higher pitch than normal.
One Man's Worth: Part 1 - S4-E1
Continuity mistake: When Bishop and Shard first appear in the alternate present timeline, they appear right next to the doorway of the infirmary where Wolverine, Storm and others are taking refuge. When the shot changes to Bishop stating that they have arrived too late, he and Shard are suddenly several yards away from the doorway. (00:07:20)
One Man's Worth: Part 2 - S4-E2
Audio problem: When Forge says "It's damaged," his mouth is completely closed for the first word. (00:08:10)
One Man's Worth: Part 2 - S4-E2
Continuity mistake: When Bishop is setting the unconscious Xavier against the wall, his gun holster changes from brown to yellow. (00:19:00)
One Man's Worth: Part 1 - S4-E1
Continuity mistake: Throughout the episode, the butt of Bishop's gun is brown when holstered. When he is firing the gun towards the end, the butt is gray.
Family Ties - S4-E17
Other mistake: This series is in the same continuity as the other Marvel animated series that aired around the same time - Spider-Man, Iron Man, The Incredible Hulk, and Fantastic Four - by virtue of each aforementioned show crossing over with at least one of the other shows. However, in Iron Man, Scarlet Witch has an Eastern European accent, and in this episode she has an American accent.
Answer: Chris Potter, the original Gambit voice actor, did indeed quit the role in the 4th season. His last episode was The Phalanx Covenant Part 1 so it seems reasonable that Fox would limit the use of the character even though it was recast. It doesn't appear that Potter left the role due to animosity, he stated in an interview that he wished to play Gambit in the first live action X-Men film.
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