Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When Gyrich is telling Jubilee that he wants to ask her about the mutants that helped her at the mall, the microphone is up to his mouth. When the shot changes to him tapping his right index finger on the desk, the microphone is nowhere near his mouth. (00:04:27)
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 Gambit says "You wanna play with Gambit? Here, take a card!" the glove on his right hand is missing, then is suddenly back on his hand when he says "House wins." (00:05:50)
Night of the Sentinels: Part 2 - S1-E2
Character mistake: When Beast is uploading the virus to delete all the mutant files from the computer, Storm destroys the monitor with a bolt of lightning and says they have run out of time. Destroying the monitor wouldn't magically erase the files. While she may not know that, Beast definitely would, so at the least, he should have asked her to destroy the computer tower and hard drive as well. (00:06:13)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: After Cyclops tells Gambit to blow up the fence and Rogue flies into frame, her headband and the patches on her uniform that are all normally black are now red. Additionally, the black encircled X on a red background on the left side of her chest is now a yellow X on a red background. (00:06:35)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: Immediately after Storm, Wolverine, Beast and Morph exit the Mutant Registration Center, Beast and Wolverine are shown to be running alongside Gambit and Cyclops. However, mere moments later, Gambit is shown to be blowing up a security fence so Storm, Wolverine, Beast and Morph can rendezvous with Gambit, Cyclops and Rogue. (00:06:45 - 00:07:20)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When Rogue catches the security guard from the collapsing tower, he has black hair. When she is flying through the air with him as well as when she dumps him in the grass, his hair is red-orange. (00:06:50)
Night of the Sentinels: Part 2 - S1-E2
Audio problem: When the tower guard is saying "Put me down, you flying freak," his mouth is not moving. (00:06:54)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When Professor X is asking Jean what's wrong, the upper corners of his eyebrows are not filled in properly. They are the same color as his skin. (00:07:41)
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 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 Cyclops is standing in the doorway to the garage, the communication device on his bandolier is entirely red, when there should be a black X on it as well. (00:09:42)
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 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
Other mistake: When the Sentinel throws Wolverine over the trees, you can hear him crash to the ground as soon as his body disappears from view. The ground in the area is flat with no tall hills, so Wolverine would require another second or two after clearing the treeline to crash to the ground. (00:10:24)
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 Storm is flying away with Cyclops in tow, she is holding him by his left arm. A couple of shots later, she is holding him by his right arm. (00:11:25)
Night of the Sentinels: Part 2 - S1-E2
Other mistake: After Storm and Cyclops fly away from the barrage of Sentinels, one Sentinel is shown to have his right foot "floating" on top of the left foot of another Sentinel, almost as if their feet were occupying the same space. (00:11:25)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When Rogue goes to touch Wolverine with her bare hand to stop him, she is shown removing the glove from her right hand. After Wolverine collapses, Rogue is now missing the glove from her left hand, and her entire left arm, including the hand, is solid green. (00:11:55)
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)
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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