I saw the film again yesterday and noticed a few things:
A possibly unintentional reference to Wanted when Magneto guides the bullet at Raven after passing by James McAvoy.
At the beginning of the film, we see the X-Jet fly over the Great Wall of China, where Sentinels are standing watch, and yet somehow don't see or hear the jet.
I'm greatly amused how Trask goes out of his way to point out to the Congress oversight committee that homo sapiens is us. May have been intended for the audience (which is kind of sad, in itself), but I like how it was directed at Congress, considering some of the nutters we have in there right now.
After Raven crashes out of the window in Paris, people are clearly alarmed by her blue appearance and even more so when she mimics the appearance of a bystander. When Erik comes swooping down from the window and intangibly draws Raven back towards him, no one seems to be terrified by what they're seeing because they don't know what's going on. Yet, they finally freak out and start running away when Hank shows up in full-blown blue Beast mode. An interesting contrast between unperceived and understood threat.
I'm not sure how I haven't heard "Time in a Bottle" before (it's vaguely familiar) but it's a great choice for the Quicksilver sequence (and love that Quicksilver wore a Dark Side of the Moon t-shirt). So is "The First Time Ever I Saw Your Face," another song I'm somehow unfamiliar with until now. And while I managed not to figure out "The Naked Time" was the episode featured in the background, I somehow picked up Sanford and Son just from the first few frames shown (before the title card was shown later), despite never really watching the show.
Lastly, I noticed that a scene from the third trailer is absent from the film, a scene which may help explain why Raven rescued Logan from the river (or least how she even knows who he is). In the trailer, Raven is sitting down in her human form and says "Why?," followed by Logan (standing) "You're a cold-hearted bitch," to which she replies "Well, don't hold back." More than anything else, I'm wondering where that scene would fit into the film.