Visible crew/equipment: When Rev. Scott swims up the first stairwell, after pushing aside the dead crew member, as his head comes up the shaft, you can see, very quickly, the flippers of a crewmember swimming out of the shot behind him. (01:22:55)
Visible crew/equipment: During the dining room scene when everyone is eating. Look for the shot where Shelly Winters reaches over to Manny's plate, in the background you can see a boom mike.