Corrected entry: As Mystique is about to shoot Trask, Xavier gets in her head in order to convince her to not do it. The time is seemingly frozen as they 'converse'. Hank/The Beast encourages Xavier during their 'conversation'. The problem here is that the 'communication' is happening in a brief moment, a split second maybe. There would be no time for him to support Xavier as Mystique's decision would already have been made.
Corrected entry: During the initial Sentinel attack, there's an error regarding Blink's portals, and the inconsistent way with which they are routed. We see a Sentinel lured into one, turn around, and then try to go back through it. However, simply turning around to reenter the portal should have resulted in the Sentinel being back in his original location, ie. on the far side of the first portal, facing away from Blink. But instead we have the Sentinel ending up on the closest side, facing towards Blink. (00:06:55)
Corrected entry: Blink only uses her portal ability defensively (i.e. to escape). In theory, she should be able to single-handedly destroy all the sentinels by cutting them in half with her portals (as shown in her death scene when a portal severs a sentinel's arm) or at the very least create portals below the sentinels' feet and cause them to fall down mountains, etc. The only reason she didn't use her skill offensively was because the script writers needed the sentinels to be a threat to the mutants.Teru_Kage
Corrected entry: Xavier finally re-enters Cerebro room and dusts-off his helmet - dust would have no-way of accumulating like that in a secret basement air-tight room.