The Dark Phoenix (2): The Inner Circle - S3-E12
Continuity mistake: Rogue rips off Donald Pierce's cybernetic left arm, but when he is first shown running away, his right arm is the one that is missing. When he catches up with Sebastian Shaw in the secret passageway, his left arm is back to being the one missing.
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Serious B
Continuity mistake: Wolverine first enters the sewers by ripping away a fence in the subway. When Jubilee and Gambit follow him, the fence is still intact. When they get closer it is torn again. Odd, really, because on the whole this show has few continuity errors, like self-mending clothes in other cartoons.
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Revealing mistake: When Rogue puts the dome in place, if you look closely you will see that the dome is resting on thin air (note that you can see the sky through the platform she sets it on, and when she sets it down, the underside of the dome is visible).
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Serious BSlave Island - S1-E7
Factual error: When Professor X is calling Moira McTaggart in Scotland, the phone number he uses is shown to have only dialed the exit code of 011, followed by a fictional seven-digit number with a 555 prefix. Since he is calling from the United States, he would have to dial the country code (44) and area code for the right part of Scotland. Plus UK numbers at that time had at least 9 numbers.
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Serious B
Slave Island - S1-E7
Plot hole: After Storm's attempt to escape the Genoshan prison is thwarted, she ends up in the ocean right at the shoreline of the beach, where she is captured by a Sentinel. Aside from the fact that it makes no sense for a Sentinel to be hiding in the ocean in the event that a mutant tries to escape the prison, there is absolutely no way that a two-story tall robot could hide in the ocean right by the beach, as the water would be way too shallow. You can even see that the water level only goes up to the Sentinel's ankle area when it is standing upright in the ocean.
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Serious B
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.
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Serious B
Continuity mistake: Bella Donna's engagement/wedding ring from Gambit doesn't appear on her finger until she mentions that she still wears it.
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Serious B
Have Yourself a Morlock Little Christmas - S4-E12
Other mistake: When Gambit is tasting the food in the crock pot, his left arm has been drawn backwards.
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Serious B
Family Ties - S4-E17
Revealing mistake: When Quicksilver is fidgeting inside his containment shell, the animators neglected to properly sync his body movement. You can see that his shoulders are not "connected" to his arms, as if his head and shoulders were separated from the rest of his body.
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Serious B
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.
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Serious B
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.
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Serious BOther 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.
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Serious B
Revealing mistake: When Rogue's phone is ringing you can see that the phone is halfway absorbed into her mirror.
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Serious BHave Yourself a Morlock Little Christmas - S4-E12
Other mistake: Rogue states that this is Jubilee's first Christmas as an X-Man. However, Jubilee was already a member of the X-Men when Senator Kelly declared his candidacy for President in season 1, and the season 2 premiere episode showed him being sworn-in as President. Election Day is in November and the President is sworn-in in January, so Jubilee should have already had at least one Christmas as a member of the X-Men.
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Serious B
Beyond Good and Evil: Part 2 - S4-E9
Continuity mistake: Magneto straps Wolverine to the port side of a boat and then drops the boat on a warehouse. When Gambit is freeing Wolverine, Wolverine is suddenly on the starboard side of the boat. After Gambit frees Wolverine, they are both shown to be on the boat's port side.
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Serious B
Beyond Good and Evil: Part 1 - S4-E8
Revealing mistake: When Mr. Sinister is mocking Jubilee, take a close look at his neckline as he moves his head. The animators moved his neckline as he moved his head, but his shoulders stay in place, so his head and neck look like they are floating above his shoulders.
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Serious BFactual error: When Rogue attempts to correct the space shuttle's flight path, she has to let go because of the intense heat due to re-entry. Indeed, a temperature as hot as a shuttle in re-entry (upwards of 3,000° F) would have completely melted through her gloves, yet when she lets go, they only have a little smoke coming off them.
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Serious BFactual error: The Moon is more than 230,000 miles away from Earth, yet in a shot of Asteroid M just outside of Earth's orbit, the Moon is right there as well.
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Serious BFactual error: When Moira is calling her ex-husband Joe in Edinburgh from the Blackbird phone, she dials a typical U.S. seven-digit phone number (it looks like she dials 555-1238). However, even assuming she wouldn't be required to dial an exit code from the Blackbird, a typical Edinburgh phone number would have more digits, along the lines of +44-131-XXX-XXXX.
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Serious B
