Continuity mistake: When Omega Red ties up the parliament member with his coils, there is a space of about two feet between the man and Omega Red's wrist. When Omega Red begins siphoning the man's life force and reeling him closer, there is suddenly more distance between the two. (00:09:24)
Continuity mistake: When Omega Red is at the podium and gloating about the rebirth of the Soviet Union, the hammer and sickle emblem on the podium is the same color as the rest of the podium. When he destroys the podium, the hammer and sickle is now red on a blue background. (00:15:08)
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 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: 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 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: 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: 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 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)
'Til Death Do Us Part: Part 2 - S2-E2
Continuity mistake: When Magneto and Professor X meet in Antarctica, the white stripes on Magneto's right glove are red in one shot. (00:20:10 - 00:20:45)
'Til Death Do Us Part: Part 2 - S2-E2
Continuity mistake: When Beast and Rogue are standing outside the hospital, there is a beige car in front of them. When the shot changes, the car is gone. (00:05:12)
'Til Death Do Us Part: Part 2 - S2-E2
Continuity mistake: When Rogue and Beast first enter Storm's hospital room, Rogue is standing at the head of Storm's bed. When Rogue berates Beast for not assisting her and Storm at the end of the previous episode, she is now standing at the foot of the bed. (00:05:45 - 00:06:06)
'Til Death Do Us Part: Part 2 - S2-E2
Revealing mistake: In the second shot of Rogue and Beast standing outside the hospital, you can see they are floating about a foot above the sidewalk. (00:05:16)
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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