Revealing mistake: In the first scene of the film, Evan is writing frantically in a journal and his last words that the camera zooms in on are "Save her". Look closely and you can see that those same words are already indented on the page as indicated by a visible letter "s" and "h" and a period that had already been written on the pad of paper. Obviously they had done some other takes. (00:01:35)
Revealing mistake: In the scene where Evan wakes up and notices that he has no arms, right when you see the stubs you can see a faint shadow moving next to his head and moving on the headboard. This shadow is the shadow of his hand before it was digitally removed. (00:29:15)
Revealing mistake: Although the film is supposedly set in New York, there is a Canadian speed limit sign in one of the first shots. Across the street which Evan lives on.
Answer: The Shazam app on my phone didn't recognize it, so it is probably just some nameless incidental music composed for the movie.
Phaneron ★
Hear You Me, performed by Jimmy Eat World.