Continuity mistake: When Beast contacts Rogue on her wrist communicator, you can see she is wearing the usual yellow gloves, green sleeves and brown jacket of her uniform. When the shot changes, she is wearing the long-sleeve blue shirt without gloves that she was wearing earlier in the episode.
Continuity mistake: At the very beginning of the episode, Sauron can be seen wearing the necklace of Garokk. Not only is he not wearing the necklace a few shots later, but he isn't even supposed to have the necklace until a few minutes later in the episode when Zaladane gives it to him after he reverts to his human form.
00:01:05 - 00:04:10Serious B