Plot hole: After Magneto and Xavier discover that their powers have vanished, Mr. Sinister is shown to be watching them through surveillance footage, zeroed in on their faces from a straight angle. At this point, Magneto and Xavier are standing at the edge of a cliff in the Savage Land, which is a jungle hidden in Antarctica. There's no conceivable way Mr. Sinister could have security footage of them from where they are located. Any camera would have to be mounted onto a tree, and the cliff is at a considerably higher elevation than the jungle itself, as well as a considerable distance away. Even if Mr. Sinister was able to zoom in on them from such a distance, the treeline being lower than the cliff would only allow him to view them from a low angle, and that's only if the cliff wall didn't obscure them. (00:20:00)
Continuity mistake: When Storm is reunited with Mjnari after purging Shadow King from her body, Mjnari has a tear coming out of the outside corner of his right eye. When the shot changes, the tear is gone. (00:16:03)
Continuity mistake: When Shadow King is saying Rogue will not dare attack him while he is possessing Storm's body, Storm's left earring has been drawn behind her earlobe. (00:11:27)
Continuity mistake: When Rogue is saying that Storm threatened to flood the hospital kitchen if they didn't release her, Storm's left hand, which is draped over her hip, is colored white. (00:03:13)
Continuity mistake: In the flashback of Shadow King terrorizing a young Storm, in one shot she is shown sitting on the palm of his left hand. When the shot changes, she is now on the palm of his right hand. (00:15:18)
Continuity mistake: When Rogue is saying that Xavier could barely handle the Shadow King, Storm is looking over her right shoulder. When the shot changes, she is looking forward. (00:09:47)
Continuity mistake: When Morph is wiping down the bar, he is wiping from left to right. When the shot changes, he is wiping up and down. (00:07:09)
Continuity mistake: When the riverboat captain is talking about how Wolverine is looking for Morph, Wolverine is standing several feet away looking over the side of the boat. When the shot changes, Wolverine's left arm is suddenly behind the captain's back, offering his monkey a peanut. (00:04:41)
Continuity mistake: When the opening of the Astral Plane is first shown emerging from Mt. Kilimanjaro's Kibo summit, the summit is correctly depicted as being somewhat flat. Near the end when the opening of the Astral Plane is diminishing, the mountain summit is shown to have a pyramidal peak. (00:02:35 - 00:16:50)
Continuity mistake: The boomerang that Xavier uses to throw at the jungle warrior astride the pterodactyl appears from nowhere. While it probably belonged to the warrior himself, neither he nor the other warrior with him were shown to have dropped it when they swooped by and captured Magneto and knocked Xavier down. (00:20:15)
Audio problem: When Magneto is saying "Strange. What would restore your...," his mouth remains wide open and unmoved after saying "restore," which would make it impossible to then say "your." (00:19:45)
Audio problem: When Storm is saying "But I do know that his thoughts were with us today," her mouth isn't moving. (00:19:00)
Continuity mistake: When Wolverine falls down the mine shaft, debris is shown to be falling with him. A few shots later, there is no debris to be seen on the ground where he landed. (00:13:15)
Continuity mistake: Storm's eyes alternate between being brown and blue throughout the episode.
Revealing mistake: When Morph is saying "You never were very bright," part of his shirt collar has been drawn on his chin. (00:07:20)
Continuity mistake: When Storm and Rogue are flying towards Storm's village in Tanzania, at one point Storm's hands are colored white. (00:05:25)
Continuity mistake: The graphic of Africa that Beast and Jean are observing is horizontally stretched at one point. (00:02:50 - 00:03:50)
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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