'Til Death Do Us Part: Part 1 - S2-E1
Other mistake: When Morph, disguised as the reverend, is saying goodbye to Cyclops, the characters in the background never move a muscle. (00:04:10)
Other mistake: When the Lady Gardener touches the flower on her table, it instantly dies, which elicits a shocked reaction from her. This show establishes that mutant powers begin to manifest during puberty, and this character is middle-aged. A character that has been living with their powers for that long shouldn't be shocked at what her powers do. (00:03:56)
The Unstoppable Juggernaut - S1-E8
Other mistake: When Wolverine is searching for clues as to who destroyed the mansion, he clears out some rubble to reveal two of Juggernaut's footprints. Given that the Juggernaut tore down the entire mansion, his footprints should be everywhere, not just in one spot. (00:04:10)
'Til Death Do Us Part: Part 1 - S2-E1
Other mistake: When Gambit is attempting to kiss Rogue at the wedding, the man standing over Gambit's right shoulder has no face. (00:04:03)
Other mistake: When Xavier is in the War Room with the rest of the team showing where the closest he could pinpoint Cyclops and Jean's location is, he is sitting in one of the chairs positioned around the table. Xavier is paraplegic and usually sits in his own hover chair. While there's no reason he couldn't be sitting in a regular chair, it would be very impractical for him to do so, especially if he's just instructing his team where they need to go. (00:11:07)
Other mistake: Whenever Rogue touches someone's bare skin with her own, it is accompanied by an energy surge to indicate she has drained them of their powers. However, when she is performing mouth-to-mouth resuscitation on Cyclops, the energy surge doesn't occur. (00:10:26)
Other mistake: When Cyclops is turning on his communication device to talk to Storm, his fingernails have been drawn on his gloved hands. (00:18:50)
Other mistake: Julianne Klemm, the writer for this episode, has her first name misspelled in the opening credits as "Julaianne." (00:02:07)
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)
Other mistake: After Gambit explodes the statue that was about to fall on Wolverine, there is no debris shown to be flying around them even though the statue was collapsing towards them. (00:16:30)
Other mistake: When the tank falls through the hole in the bridge, the tank's occupants are impossibly shown to be clinging to the edge of the hole at the same time the tank is going over the edge, as if the tank and the occupants were occupying the same space. (00:09:40)
Slave Island - S1-E7
Other mistake: When the Leader is backing away from Cable, his right hand and right foot pass through a puddle of water, but the water does not react to the movements. (00:19:05)
Slave Island - S1-E7
Other mistake: After Cable shoots his exploding plasma blast at the table that Gyrich, Trask, Hodge and the Leader are sitting at, the former three all evacuate the area while the Leader is still shown to be sitting at the table only a moment before it explodes, but he does not suffer any ill effects from the concussive blast or wooden shrapnel. (00:14:45)
Slave Island - S1-E7
Other mistake: When Cyclops, Rogue and Jean Grey exit the War Room to depart for Genosha, at the top of the door frame there is a black spec moving around, possibly indicating that there was some debris or a clump of dust on the animation cells or the camera lens itself during filming. (00:08:15)
Other mistake: When Gambit pushes Bella Donna down, the wedding veil that she was wearing comes to a stop in midair. (00:14:25)
Other mistake: When Wolverine is threatening Pierre, there is a continuous shot lasting roughly 8 seconds in which Bobby is telling Rogue about Bella Donna, all the while Wolverine and Pierre remain in the foreground, and neither of them so much as moves a muscle in that 8-second span. Rogue also remains motionless for a majority of the shot. (00:13:35)
Other mistake: When Bella Donna's henchman is letting Bobby go, he is shown to be walking over to Bobby empty-handed. After he unties Bobby, the tithe box has magically appeared in his hands. (00:11:10)
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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