Revealing mistake: When Rogue's phone is ringing you can see that the phone is halfway absorbed into her mirror. (00:04:15)
Continuity mistake: The Colony's Acanti ship goes from having its face buried into the walls of the chasm and its body above ground to having its body partially buried in the valley floor and its face free from the wall. (00:06:50 - 00:08:10)
Revealing mistake: Wolverine's nipples literally disappear from his chest when he says "Do I feel lousy." (00:07:15)
Factual error: Wolverine is able to call the mansion from a payphone without depositing any money, nor is he shown to be using a prepaid phone card or making a collect call. (00:09:40)
Continuity mistake: When Gambit notices Cody on the monitor, the pink rectangular patches on his pants that are normally horizontal are now vertical. (00:10:30)
Audio problem: With the exception of the last word in the sentence, Cody's mouth is completely closed when he says "They need us Rogue, just like I need you." (00:13:40)
Audio problem: When Wolverine says "I'm going to get this outta me!" his mouth is wide open for most of the line. (00:14:05)
Other mistake: The tail that Rogue grows appears out of thin air as if it were magic. Given that she's going through an organic transformation, the tail should have formed gradually out of her coccyx. (00:15:55)
Other mistake: After Rogue absorbs Wolverine's healing powers and purges the transformation spores from her system, she reverts back into human form including losing the tail that she grew. Given that the tail protruded from her backside, there should have been a hole in the back of her pants afterwards, yet there is none. (00:16:40)
Secrets, Not Long Buried - S4-E15
Plot hole: At the speed Cyclops is traveling in his mini-jet when he passes Watchdog's tower, he would have been long out of range before Watchdog could force him out of the air into a crash landing, considering that Watchdog had to take time to alert Solarr of Cyclops' presence and be ordered to knock him out of the air. (00:02:30)
Secrets, Not Long Buried - S4-E15
Revealing mistake: Instead of staying in place, the energy surging around Watchdog's head moves down the screen as the camera pans down. (00:02:35)
Secrets, Not Long Buried - S4-E15
Other mistake: At one point after Cyclops ejects from his mini-jet, you can see that he is just floating in midair instead of descending back to the ground. (00:03:15)
Secrets, Not Long Buried - S4-E15
Audio problem: When Solarr, Chet and Toad are laughing at Cyclops, the sound of their laughter begins about a second before they actually start laughing. (00:11:45)
Secrets, Not Long Buried - S4-E15
Revealing mistake: When the Lady Gardener shuts her door on Cyclops, his right arm stays inside her house in front of the door frame. (00:14:35)
Secrets, Not Long Buried - S4-E15
Continuity mistake: The mutants that have gathered for Solarr's speech are in different places throughout depending on the shot. (00:16:50 - 00:18:50)
Secrets, Not Long Buried - S4-E15
Other mistake: When the group of mutants are listening to Solarr's speech, in one continuous shot of ten of them that lasts at least four seconds, they are all standing completely still, not one of them moving a muscle, blinking or making the slightest adjustment in their facial expressions. (00:17:00)
Secrets, Not Long Buried - S4-E15
Continuity mistake: During the battle at the end, Cyclops uses the crystal statue he brought with him in the fight by throwing it into the air and uses it to refocus his optic blasts on a crowd of attackers. After the battle is over he gives the statue to Dr. Prescott without ever having retrieved it. (00:18:55 - 00:20:20)
Secrets, Not Long Buried - S4-E15
Audio problem: After Cyclops crash lands, the shot changes to Watchdog observing the crash on his monitor with a voice-over saying "Scratch one trouble maker," except that the voice speaking is that of Solarr and not Watchdog.
Continuity mistake: When Xavier is surrounded by a group of mutants in his subconscious, if you look at Quicksilver you can see that the colorist made his shirt flesh-colored. You can tell he is supposed to be wearing a shirt because the lightning bolt design is still going across his torso. (00:05:20)
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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