One Man's Worth: Part 2 - S4-E2
Continuity mistake: When Fitzroy is draining energy from Xavier in order to create a time portal, he is completely surrounded by Bishop, Storm and Bantam. A few shots later there is no one standing around Fitzroy and Xavier. (00:18:35)
One Man's Worth: Part 2 - S4-E2
Continuity mistake: When the coffee shop owner is caught in Storm's whirlwind, his beard is flesh-colored. (00:03:35)
One Man's Worth: Part 2 - S4-E2
Continuity mistake: When Bishop is setting the unconscious Xavier against the wall, his gun holster changes from brown to yellow. (00:19:00)
Weapon X, Lies, and Video Tape - S3-E19
Continuity mistake: The metal tubes on the back of Wolverine's gloves disappear when he is bidding Silver Fox farewell. (00:19:15)
Weapon X, Lies, and Video Tape - S3-E19
Continuity mistake: After Beast opens the door for Wolverine, the room on the other side goes from being lit up to completely dark. (00:05:20)
Continuity mistake: The monks give Rogue a robe to wear over her tattered ski suit. When she says she needs to go check on Gambit, she is suddenly not wearing the robe. (00:07:00 - 00:07:50)
Continuity mistake: When Rogue walks in on Brother Reinhardt attempting to kill Gambit, she goes from being gloveless to wearing blue gloves depending on the shot. (00:08:20)
Continuity mistake: When Rogue is attempting to rescue Gambit from the avalanche, Gambit's right hand goes from being gloveless to gloved. There is even a point when she is pulling him out of the snow that a glove instantaneously materializes on his hand and then disappears just as quickly. (00:05:20)
Continuity mistake: In the opening scene, the security guard's badge disappears between shots. (00:01:10)
Continuity mistake: Gambit is gloveless when he is lying in the snow. When he falls downhill, he is suddenly wearing gloves. (00:04:35)
Continuity mistake: After Storm is caught in a net and uses a lightning bolt to burn a hole in it, the net has magically disappeared altogether in the next shot. (00:14:30)
Continuity mistake: When Cyclops is telling Raknar that he hasn't agreed to anything, the back of Raknar's head is flesh-colored when it is shown to be black throughout the episode. (00:14:00)
Continuity mistake: Corsair's normally brown eyebrows and mustache are suddenly black when Cyclops is asking him if he would have come back for him and his brother had he known they were alive. (00:11:10)
Continuity mistake: Cyclops' gloves disappear when he jumps off the pier. (00:04:10)
Continuity mistake: When Lorna discovers Havok half-buried under the boxes, the shirt he was previously seen wearing under his jacket is missing. (00:17:55)
Continuity mistake: Jubilee's earrings disappear when she insists on helping Iceman inside the compound. (00:11:55)
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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