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: After Joe hangs up on Moira, if you look at Wolverine in the background you will see that his face is colored yellow. (00:17:30)
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)
Continuity mistake: During Xavier's flashback, Jean Grey goes from wearing her current (as of the show's broadcast) uniform while training in the Danger Room to her original "Marvel Girl" uniform when Amelia is leaving the mansion. Additionally, when Xavier is talking to Amelia in the Danger Room's control room, he is in his usual hoverchair, yet when Amelia is leaving the mansion, he is in a regular wheelchair. (00:05:25)
Continuity mistake: After Moira and Banshee are knocked back into the wall by Proteus, the amount of rubble around them changes between shots. (00:02:15)
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 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
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.
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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