Other mistake: The Red Skull reveals that Cocteau is the one who sounded the alarm on Wolverine and Captain America, but at the time the alarm starts going off, there are no switches on the walls for him to have pressed, not to mention he was shown to have been standing in the middle of the corridor out of arm's reach of either wall. (00:09:35 - 00:10:20)
Continuity mistake: When the Nazis begin to surround Wolverine and Captain America, a group of them are shown to be coming through a door and into a very large room, despite the fact that the scene is actually taking place inside a narrow corridor. (00:09:50)
Continuity mistake: When Red Skull is leaving Wolverine and Captain America alone, he sets Captain America's shield on a table and Wolverine is shown to be hanging from stocks by his wrists with Captain America on his left and the table on his right at roughly a 45 degree angle. In a wide shot after Red Skull has left the room, the shield has vanished from the table and Wolverine is now several feet from where he originally was, with Captain America roughly at his 12 o'clock and the table roughly at his 3 o'clock. (00:10:45)
Continuity mistake: When Captain America says "Red Skull, wait!", his sleeves are entirely blue whereas they should be white from the mid-bicep and down. (00:10:45)
Continuity mistake: The Red Skull punches Captain America's shield with his left hand, but then shows pain in his right hand. (00:13:10)
Continuity mistake: Wolverine's gloves have suddenly disappeared after the robot is destroyed,. (00:15:05)
Other mistake: When Justine is telling Wolverine about her father's accomplishments in the war, the cel shading is very fuzzy throughout the entire shot. (00:18:30)
Other mistake: When Wolverine is carving "HERO" into Cocteau's tombstone, he is shown to be using all three claws on his right hand to do so, but the carving looks like it was only carved with one sharp point. If he was using all three claws, each point of articulation for each letter should have been tripled. (00:19:05)
Continuity mistake: After Wolverine carves "HERO" onto Cocteau's tombstone, he has to walk several feet away from the tombstone to get to Justine. When the shot changes, both of them are only a couple steps away from the tombstone. (00:19:15)
Factual error: When Dr. Essex is walking through the museum with Charles Darwin, a fully-assembled dinosaur fossil is on display. This scene takes place in London in 1859, but the first ever dinosaur to be displayed didn't occur until 1868 in Philadelphia. (00:03:55)
Continuity mistake: When Rogue and Gambit are playing pool, Rogue's arms are bare from the elbow down except a yellow wristband on each wrist. When Beast comes in with the mail, Rogue is wearing her usual green sleeves and yellow gloves. (00:04:00 - 00:05:10)
Character mistake: When Beast is showing Gambit and Rogue the news report about Cannonball, it is shown to be featured in a magazine called Philologist's Quarterly. When Beast leaves the room, he remarks "Ah, there's my 'Philologist's Quarterly'." as if he didn't already see it. (00:04:25)
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.
BaconIsMyBFF