moviemaster101

Correction: I don't think this is really a "mistake." All that happened was that the camera shakes because it's mounted on the bed and the bed fell over. It didn't cause any noticeable issues, didn't give anything away onscreen, and didn't cause any continuity problems. If this counts as a "mistake," it opens a massive can of worms in which many types of shots and camera movements could arbitrarily be considered "mistakes" by default.

TedStixon

Correction: This round, metal device is actually part of the creature's head. You can see that the blood (which is actually digital) comes from the side of it, not the device itself, and even see the "gunshot" light up the inside. Modern squibs (which are used to simulate gunshot effects) look nothing like this "device."