Continuity mistake: Bella Donna's engagement/wedding ring from Gambit doesn't appear on her finger until she mentions that she still wears it. (00:10:55)
Continuity mistake: When Pierre is waiting for Gambit in his boat, there is another boat next to his. When he and Gambit take off, the second boat has disappeared. (00:07:55)
'Til Death Do Us Part: Part 1 - S2-E1
Continuity mistake: Beast disarms a member of the Friends of Humanity whilst perched on a street lamp. When the angle changes to a wide shot, Beast is much higher on the lamp post and would have been too far out of reach to disarm the man in the first place. (00:11:45)
Continuity mistake: When Gambit first walks into Bobby's cell, Bobby is sitting in a chair up against the back wall. A few shots later, Bobby is sitting in the center of the cell. (00:09:55)
Continuity mistake: When Pyro is unmasking Ms. Marvel, the wristband on Blob's right arm is missing. (00:15:37)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Forge is first shown standing in front of the tube containing Wolverine's skeleton, the skeleton is incorrectly shown to be around 7 feet tall (Wolverine is only 5'3"). A couple of shots later, the skeleton is now shown to be more accurately sized. (00:05:19)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: Throughout the episode, Bishop's goatee alternates between fully covering his chin and having a small spot of exposed skin beneath the soul patch. Sometimes there is even the outline drawn of the exposed skin beneath the soul patch, but it is colored the same as the goatee. (00:05:10 - 00:20:05)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Bishop is trying to disperse the mob, the circular patches on his shoulders are red with yellow borders, and a thin circle design is within the red circle itself. Moments later when he throws Wolverine off himself, the red circles are now blank, and their borders are black instead of yellow. (00:11:00 - 00:11:50)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Bishop is shown returning to his original timeline, he is wearing the temporal band on his right arm. However, when he was sent back to his timeline at the end of the episode Days of Future Past: Part 2, he was not wearing the band because Rogue tore it off his arm and crushed it, which is what caused him to be sent back in the first place. (00:05:08)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Beast is saying that the virus was genetically engineered, the chin area of Bishop's black goatee is the same color as his skin. (00:13:01)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Graydon Creed is first shown giving his testimony, in an overhead shot, we see the front row of the benches in front of him are filled with civilians. When the shot changes, the X-Men are now occupying the row on Creed's right. (00:14:34)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When the camera is panning across the X-Men as they are listening to Graydon Creed's testimony, Wolverine's arms are folded, and you can see the top portion of the blue glove on his left hand is the same yellow color as his outfit. (00:14:27)
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 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 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 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 Xavier helps Morph overcome Mr. Sinister's mind control, Wolverine, Storm, and Gambit are standing behind Morph, and Magneto is lying on the ground. When the shot changes, Storm, Gambit, and Magneto have disappeared. (00:18:35)
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: 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)
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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