Continuity mistake: When Magneto drops Wolverine, Storm and Cyclops onto the ground, Wolverine and Cyclops are lying mostly perpendicular to Storm. When it changes to a shot of them getting up, they are all parallel to each other. (00:17:18)
Continuity mistake: When Xavier is using Cerebro to look for Magneto, his blue and black tie turns yellow when Jubilee says "Professor?" When Storm says "Charles, are you all right?", it is back to being blue and black, and the blue stripes turn yellow before our eyes. (00:11:41)
Continuity mistake: During Beast's trial, Wolverine and Cyclops are shown in several wide shots to be sitting in the gallery on Beast's side of the courtroom. However, when Sabretooth enters the courtroom, Wolverine and Cyclops are suddenly on the prosecutor's side. (00:08:25 - 00:10:57)
Continuity mistake: When the bailiffs are escorting the unruly civilian out of the courtroom, the members of the gallery behind the prosecutor are different and fewer in numbers than they were earlier in the scene when the prosecutor was making her case against Beast. (00:08:29 - 00:10:22)
Continuity mistake: When Rogue is thrown into the wall by Storm's wind, the green side of her uniform is incorrectly colored yellow. (00:03:52)
Continuity mistake: When the walls begin closing in on the X-Men in the Danger Room, the blue center of Jean Grey's outfit is incorrectly colored the same light-orange color as most of her outfit. (00:03:12)
Continuity mistake: When Storm shoots lightning at the missiles, it is yellow. When the shot changes, it is blue. (00:19:40)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When Jubilee rings the doorbell at the end, it is black. When the shot changes, it is now gray. (00:20:36)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When Cyclops first blasts the Sentinels in the factory, the part of his bandolier around his communication device is incorrectly colored red. (00:18:15)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When Gyrich both enters and exits the White House exercise room, the file folder under his arm is the size of a briefcase. When he angrily throws the folder, it is now the standard file folder size. (00:14:45 - 00:15:17)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When the pool hall patron is pleading Cyclops to put his glasses back on, the yellow patch on his vest turns red. (00:14:20)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When Wolverine is walking towards his jeep after leaving the pool hall, his jeep looks more like a truck. Additionally, the car parked next to him is light blue, but then is red when Wolverine is climbing in his jeep. (00:14:23)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When Rogue begins to siphon off Wolverine's energy, her headband is incorrectly colored red. (00:11:58)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When Storm shoots a bolt of lightning at a Sentinel after Cyclops tells Wolverine to pull back, the lightning is incorrectly colored red (her lightning boots are otherwise shown to be yellow). (00:11:12)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When the heroes are shown running away from the Mutant Registration Center, right before the Sentinels show up, Beast is right behind Morph. When Morph gets blasted by the Sentinels, Beast is now nowhere near Morph and shown to be running alongside Gambit and Cyclops. (00:09:51)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When Wolverine is out driving his jeep, in one shot, the windshield is missing. (00:09:47)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When Wolverine is tearing off the roof of Cyclops' car, the sun roof is incorrectly colored red. Additionally, Wolverine's jeep is parked next to Cyclops' car, but is not visible when he is tearing the roof off. (00:09:13)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When Jean removes Cerebro and collapses to her knees, the chair she was sitting in disappears when the shot changes, as does the large roundtable and chairs in the center of the room. Additionally, two red stripes suddenly appear on Cerebro after Jean sets it on the floor. (00:07:42)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When Trask is approaching Gyrich, the desk Gyrich was sitting at extends beyond his body, and his hands are resting on it. When the shot changes, Gyrich is standing in front of the desk, and his hands are down at his sides. (00:05:06)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When Gyrich's face is first seen as he is talking to Jubilee, you can see a wall to his right. A few shots later, you can see a Sentinel is standing to his right, and there is not a wall anywhere near him. (00:04:27)
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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