Have Yourself a Morlock Little Christmas - S4-E12
Continuity mistake: Rogue's headband is flesh-colored when Beast says "It would appear that my face is not the world's most reassuring." (00:16:30)
Have Yourself a Morlock Little Christmas - S4-E12
Continuity mistake: When Leech is first shown in his sick bed, he is shirtless and under the sheets. When he begins receiving a blood transfusion from Wolverine, he is fully clothed and also wearing a beanie. Given the weak and near-death state he was in, it's extremely unlikely the other Morlocks would bother dressing him. (00:09:20 - 00:14:15)
Have Yourself a Morlock Little Christmas - S4-E12
Continuity mistake: The brown patch on Ape's left leg disappears when he gets up to assist in Wolverine's blood transfusion for Leech. (00:13:15)
Have Yourself a Morlock Little Christmas - S4-E12
Continuity mistake: When Jubilee is holding Mariana, her right arm goes from cradling Marian's head to being under her bottom. Jubilee also goes from wearing yellow gloves to being bare-handed. (00:11:40)
Have Yourself a Morlock Little Christmas - S4-E12
Continuity mistake: Callisto's eye-patch changes sides when she is berating Storm. (00:09:30)
Have Yourself a Morlock Little Christmas - S4-E12
Continuity mistake: Jubilee's presents suddenly become smaller when she, Storm and Wolverine depart for the Morlock tunnels. (00:08:45)
Have Yourself a Morlock Little Christmas - S4-E12
Continuity mistake: The boxes and ribbons in the stack of gifts that Jubilee is carrying change color. (00:05:20)