See the Spoiler-y Top Secret Crash Footage From Super 8
Let us say it again: SPOILERS! In fact, to be totally honest, Vulture has not even watched this video, because we want to maintain a sense of childlike wonder for the movie. But if you wish to proceed: Below is footage (not filmed by the kids, maybe filmed by the military?) that apparently gives some clues about the monster, so watch at your own risk.