Continuity mistake: When Fabian Cortez is scapegoating Gambit in front of the mob, he grabs him by the blue clothing that lines the body armor on his chest. When he says to Gambit "Mark my words X-Man..." the blue clothing is now the same brown color as Gambit's trenchcoat. (00:05:20)
Continuity mistake: After Magneto crashes through the roof of the U.N. building, the nameplates designating the nations of the delegates have suddenly become blank. (00:02:20)
Continuity mistake: At the very end of the previous episode after Proteus had messed with Wolverine's sense of reality, Wolverine is shown whimpering in an open area. When Wolverine is shown at the beginning of this episode still whimpering, he has suddenly moved next to a treeline. Given the state of shock he was in, it's doubtful he would have gotten up and moved. (00:02:00)
Continuity mistake: When Proteus possesses the truck driver, the truck driver's wristwatch disappears in one shot. (00:15:10)
Continuity mistake: When Wolverine, Rogue and Beast are approaching Proteus in the Blackbird, in the first shot you can see through the windows that Wolverine is wearing a jacket. When the shot changes, the jacket is suddenly gone. (00:13:05)
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
Continuity mistake: When Bishop is setting the unconscious Xavier against the wall, his gun holster changes from brown to yellow. (00:19:00)
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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