Other mistake: When Magneto is asking how the Savage Land mutates were able to infiltrate his citadel, Amphibious tells him it's because Mr. Sinister long ago found his secret passage. The room they are in leads to a balcony, and has no door sealing off the balcony. In a world of superpowered beings, some of whom can fly, it wouldn't take much effort to get into a building that isn't closed off. Finding a secret passage from the ground level would be unnecessary. (00:15:00)
Continuity mistake: When Sauron is hypnotizing Xavier, the space between Xavier and Magneto is greater than previously shown. (00:16:11 - 00:18:29)
Continuity mistake: When Morph is getting ready to attack Mr. Sinister, Sinister is standing in front of Magneto and Xavier. After his henchmen tackle Morph, Sinister then approaches Morph a different part of the room. (00:17:22)
Continuity mistake: When the Nasty Boys are walking Morph towards the wall to chain him up, the wall ends and leads outside on the left, and Xavier and Magneto are chained up only a few feet away on the right. A few shots later, the wall now appears to go on continuously, and Magneto and Xavier are considerably further away from Morph. (00:17:35)
Continuity mistake: When flashes of the different X-Men's faces are being shown while Xavier is being hypnotized by Sauron, Gambit's eyes are brown with white sclera, when they should be red with black sclera. (00:18:46)
Continuity mistake: When Beast is noting how odd Xavier's message was, the sclera of Gambit's eyes are white, when they should be black. (00:19:34)
Continuity mistake: When Beast is theorizing that Xavier was coerced into contacting them, Gambit is sitting upright. When the shot changes, Gambit is now slouched in his chair (note his head is higher than the headrest in the first shot). (00:20:05)
Continuity mistake: When the Nasty Boys and the Savage Land mutates confront the X-Men, you can see Slab is wearing the white belt that keeps his mutant powers intact. Later in the scene when he is attacking Cyclops, the belt is colored brown. (00:03:46 - 00:05:07)
Continuity mistake: When Slab tosses Cyclops, you can see Beast in the background, and he is crouching down. When the shot changes, he is standing upright. (00:05:09)
Continuity mistake: When Mr. Sinister is criticizing Xavier for fawning over humankind, Morph is barehanded. When the shot changes, he is wearing gloves. (00:11:34)
Continuity mistake: When Gambit is watching Rogue being taken away, you can see the bars of their holding cell are only about a foot taller than Gambit. Later in the scene when Wolverine is attempting to free the X-Men from the cell, the bars now go all the way up to the ceiling. (00:14:13 - 00:14:48)
Continuity mistake: When Barbarus throws Wolverine onto the control panel, there are numerous buttons on it. Moments later when Vertigo is using her powers to disorient Wolverine, some of the buttons have disappeared. (00:14:56)
Continuity mistake: When Shanna sees Kazar hiding around the corner, the guard has his eyes open. When the shot changes, his eyes are suddenly closed. (00:15:13)
Continuity mistake: When Kazar and Shanna hug after he has freed her and the other captives, the lock on the cell door is missing. (00:15:30)
Continuity mistake: When Kazar and his people are storming the citadel, Morph and Xavier are spaced closer together than they were a couple of shots prior. (00:15:32)
Continuity mistake: When Wolverine frees Morph and Xavier from their bounds, Morph and Xavier are suddenly closer to Magneto than previously shown. (00:15:32 - 00:15:59)
Continuity mistake: When Vertigo is telling Wolverine to become one of Mr. Sinister's slaves, the red diamond on Sinister's chest is the same blue color as his outfit. (00:15:32)
Continuity mistake: After Ruckus prevents Kazar and his people from entering the citadel, Brainchild pulls a lever next to the door to seal them out. The lever in question wasn't there when Kazar and his people were first shown outside the door. (00:15:44)
Continuity mistake: When the X-Men have their powers restored, Jean Grey is behind Cyclops on his right, near the front of the cell. When they begin running out of the cell, Jean is now several feet directly behind Cyclops, closer to the back of the cell. (00:16:18)
Continuity mistake: The glove on Magneto's right hand disappears after Mr. Sinister blasts him in the back. (00:17:20)
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.
BaconIsMyBFF