Continuity mistake: When Leech telekinetically splits up the mob, on his left are a man with a light blue shirt, followed by a man with an orange shirt, and man with a light blue shirt behind him. On his right are a man with a green jacket and yellow shirt, a man with an orange jacket and pink shirt behind him, and lastly, a man with a blue jacket and yellow shirt. When the shot changes, the men have not only swapped sides, but now it is two men in light blue shirts in front of the man in the orange shirt, and the man with the orange jacket and pink shirt is now just wearing an orange shirt, and he is standing in front of the man with the green jacket and yellow shirt, and the man with the blue jacket and yellow shirt is in front of him. (00:06:05)
Continuity mistake: When Leech begins to telekinetically steal fruit from the vendor cart, he is stealing a red apple and what appears to be an orange with a yellow peel. When the shot changes, the orange is now orange in color, and as the two pieces of fruit move towards Leech, the orange is on his right, and the apple on his left. When the shot changes, the orange is now yellow in color again, and the fruits have swapped sides. (00:05:52)
Continuity mistake: After Jean and Cyclops first kiss after she tells him to relax a little, his left arm is around her shoulder and it suddenly jump cuts to his side with his hand in his pocket. (00:05:37)
Slave Island - S1-E7
Continuity mistake: When Cyclops, Jean Grey, and Rogue enter the War Room to tell Professor X they are leaving for Genosha, the monitor Professor X is watching is level. A couple of shots later, the monitor is now slanted downwards. (00:08:04)
Slave Island - S1-E7
Continuity mistake: When Trask is approaching Storm and the other mutants, there is a cliff wall behind him. When the shot changes, it is now the sky behind him. (00:03:55)
Slave Island - S1-E7
Continuity mistake: When the Sentinel drops Storm, there is a female guard standing by its left foot. When Trask is approaching them, it is now a male guard by the Sentinel's foot. (00:03:49)
Slave Island - S1-E7
Continuity mistake: When the lead guard is explaining the inhibitor collars to the new prisoners in the wide shot, you can see Blob at the back of the group, and he is wearing tights, even though he is usually shown wearing a speedo. (00:02:24 - 00:03:41)
Continuity mistake: When Jubilee, Gambit, and Storm are first shown in their bungalow, there is a coffee table with a couple cups near the edge on the viewer's right, and some magazines on the top corner of the same side. A couple of shots later, the cups and magazines have all moved closer to the center of the table. When Gambit sits up, the magazines have disappeared entirely. (00:19:14)
Continuity mistake: When Storm, Jubilee, and Gambit are checking into their bungalow, the desk clerk has a rose on his jacket that is missing in a couple of shots. (00:13:10 - 00:13:51)
Continuity mistake: When Storm tells Gambit to put the discount placard back, he sets it in front of the clerk's computer. When the bellhop comes to get everyone's bags, the placard has disappeared. (00:13:24)
Continuity mistake: When Cyclops and Jean Grey enter Wolverine's room at the end of the previous episode and find it a mess and him gone, Cyclops is wearing brown pants, a yellow collared shirt and a charcoal tie, and Jean is wearing a pink dress. This episode picks up where that episode ended, and suddenly Cyclops is wearing blue jeans and a purple turtleneck, and Jean is wearing off-white pants and a turquoise blouse. (00:02:06)
Continuity mistake: When Wolverine finds the unconscious Cyclops, Cyclops' sleeve is rolled all the way down. A couple of shots later, the sleeve is now rolled halfway up. (00:16:42)
Continuity mistake: When Tar Baby traps the mob inside the subway platform, he seals off the stairs with a wall of tar. When Cyclops and Jean have arrived to intervene, the wall of tar is now in front of the turnstiles. (00:06:24)
Continuity mistake: When Xavier is talking to Jean and Cyclops at the end, the three of them, along with Storm, are all to the left of the bed Gambit is lying on, with Storm being behind Xavier, over his right shoulder, and a piece of machinery behind her. When the shot changes, it is a closeup of Xavier, and neither Storm, nor the machinery are visible over Xavier's shoulder. When Jean and Cyclops leave the room, Xavier is now at the foot of Gambit's bed, several feet away from Storm. (00:20:08 - 00:20:32)
Continuity mistake: The picture of Jean and Cyclops Wolverine has framed shows them against a yellow-orange background, and Cyclops' sunglasses are red. When the picture is shown again at the end of the episode, the background is now white and Cyclops' sunglasses are gray. (00:08:14 - 00:20:44)
Continuity mistake: When Storm is offering the Morlocks sanctuary at the mansion, several of the Morlocks that were standing dozens of feet behind Storm in a previous shot are now standing in front of her. They are then behind Storm again when she is helping Callisto to her feet. (00:18:58 - 00:19:45)
Continuity mistake: When Storm defeats Callisto in combat, Sunder and Tar Baby are in the far background, standing near a tunnel opening. When the shot changes, they are now standing in front of some machinery. (00:18:58)
Continuity mistake: When Storm and Callisto are about to engage in combat, they are using staves that look like lightsabers, with the hilts at the bottom. When they start striking at each other, both staves now resemble a double-edged lightsaber, with the hilt in the middle. (00:18:25)
Continuity mistake: Callisto's staff is roughly the same length as her body. When she is holding the staff to Cyclops' throat, only the bottom quarter of it is visible, when the rest that isn't obscured by their bodies should be visible and pointing outwards at her left. (00:18:06)
Continuity mistake: When Wolverine drops Cyclops to the ground, Cyclops' body is at a roughly 45° angle to the tunnel entrance. When Jean intervenes, Cyclops' body is now parallel to the tunnel entrance. (00:17:19)
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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