The close-up of Mr. Adrian's gun, shows it has no bullets. Yet, Monte - an Army sergeant who is one foot away - doesn't see this.
Mr. Adrian's revolver clearly has no bullets.
The camera bounces noticeably when the bikers begin running down the dock.
The painter in the field reacts to the sound of motorcycles coming up behind him. However, the motorcycles don't make any noise until the second one pulls into frame.
Two men in black suits kneel down in the opening graveyard sequence. One holds a bunch of flowers with a badly-hidden mic, cord and all.
An extension cord, leading to the camera's position, is visible on the dock.
Mr. Adrian's dog disappeared from his seat in the car, between the two shots of dialogue between Adrian and with Sheila.