Continuity mistake: The way Brandon holds his rifle out the window changes. In some shots (almost every other one), Brandon is holding it at a downward angle (toward the people at ground level) but in other shots he is holding it straight out (parallel to the floor). Also, the man looking out the binoculars holds them straight out instead of at a downward angle. (01:00:43 - 01:01:24)
Continuity mistake: Before Lady Death attacks Brandon Beckett, the six garbage bags (near the front) are close to the wood block pallet (which appears to be a standard GMA @ 48"x40"), but after Brandon picks up one garbage bag to shield himself from her knife, there is more space between the garbage bags and the block pallet (which is now smaller, more like size 36"x36"). (00:34:39)
Continuity mistake: The kitchen walls were distorted (at awkward angles), but Zero got to the house around 6:46 and talked to Shelly for a short period of time. The now-blurred clock on the wall appeared to advance to almost 6:47, keeping a reasonably approximate pace with the scene's progress. However, only about 30 seconds passed until Brandon came in, but the clock (no longer blurred) had jumped to 6:50. (00:28:00 - 00:28:50)