Hmm... I misread the title as "missing explosion" which this post is indeed missing.
The first thing that comes to mind is Harry Potter 3, which probably isn't quite what you're looking for.
Any fan of the book (or someone who's read it recently, at least) can tell you that the film is missing a few bits of info that make the ending all make sense.
KAAAAAABBBBBBBBBBBOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOMMMMMMMMM!