When Bill is grabbed from the bridge, most shots show him wearing what appear to be ear protectors (from all the shooting he had been doing?). There's at least one shot where the protectors are missing, only to reappear a moment later.
When Mohawk was firing his mini-gun, the recoil should have sent him flying, yet he was able to fire without even a wobble.
At 0:40:25 -a crew member can be seen near the bottom center of the screen.
After blowing up the bomb shelter, Burt says 3 dead graboids... There was no way of knowing how many graboids were there, whether there were 3 or not, and how many have died.