Revealing mistake: When Father Karras sprinkles holy water on Regan, they forgot to paint her ear lobes and it looks terrible. (01:32:30)
Visible crew/equipment: Denise arrives at her flat and finds the OAS Member there, with his back to the camera. To his right in the mirror the right half of director Fred Zinnemann's body and forearm is visible for a split second. (00:20:40)
Visible crew/equipment: When Kananga and Bond are fighting a cable protrudes under Kananga's jacket, it even lifts up his clothes. Seemingly the mic cable. (01:54:27)
Continuity mistake: When Sgt. Howie first goes to the Post Office, he walks through to where Myrtle is painting the hare. He puts down his leather case which then changes position a few times during the next few shots, until the scene ends.