Continuity mistake: When Storm throws her communicator and the portal-opening orb on the ground for the other X-Men to find, they land right next to each other. When Jubilee finds the communicator, the orb is missing until the shot changes. (00:06:40 - 00:08:10)
Audio problem: When Wolverine says "Now move over!", you can see his reflection in the truck's windshield and his mouth is completely closed. (00:07:00)
Audio problem: When Storm says "I command the Sahara Winds," her mouth is completely still for the last two words. (00:04:00)
Revealing mistake: In the opening shot of the Washington Monument, the monument is very noticeably shaking left and right as the camera pans up (likely indicating that the monument and the background are a composite image). (00:01:00)
Bloodlines - S5-E6
Continuity mistake: The yellow vertical line on the left side of Jubilee's shirt suddenly moves to the right side when she asks about Mystique's fate. (00:18:20)
Bloodlines - S5-E6
Factual error: When Rogue tricks the Friends of Humanity into firing on their own helicopters, two men are shown to be immediately parachuting from the helicopter at an altitude of at most, 100 feet. This wouldn't really be possible because jumping from such a low altitude would require the person to immediately deploy the parachute, which in this case would cause the parachute to be torn to shreds by the helicopter's rotor. If a person jumped from that altitude and deployed the parachute after free falling enough to clear the rotor, they would have fallen too far for the parachute to have been effective in allowing them to land safely, if the parachute even opened before they hit the ground. (00:16:30)
Bloodlines - S5-E6
Continuity mistake: The metal tubes on Wolverine's gloves disappear and reappear throughout the episode.
Bloodlines - S5-E6
Continuity mistake: When Graydon Creed is struggling with Nightcrawler, his tie falls out from behind his jacket. In the next shot, the tie is back in its original place. (00:11:30)
Bloodlines - S5-E6
Continuity mistake: When Rogue is talking to Wolverine through her watch communicator, in the closeup shots the watch is shown to be around her glove, on her wrist. In the wide shot, the watch is either around her sleeve just beneath her glove or it has disappeared entirely. (00:09:00)
Bloodlines - S5-E6
Continuity mistake: When the Friends of Humanity member answers the door after Jubilee knocks, the floor is shown to be made up of square slabs. After Nightcrawler knocks him out, the floor has changed to a completely solid finish. (00:07:55)
No Mutant Is an Island - S5-E4
Revealing mistake: When Killgrave is saying "On your knees," his eyes jump off his face. (00:18:45)
No Mutant Is an Island - S5-E4
Continuity mistake: When Sarah resuscitates Cyclops, they are by the edge of the swimming pool. When the shot changes to Cyclops blasting through the screen door, the pool is nowhere to be seen, nor is the puddle of water that was under Cyclops in the previous shot. (00:16:10)
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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