Continuity mistake: When Liz and her psychiatrist are driving in the blue car to Liz's house for the first time, you can see from the outside-the-car-shot that the roof of the cabrio-car is closed, but when we see a shot from inside the car, you can see in the left top corner of the screen that the car-roof is open, later it's closed again.
Continuity mistake: When Liz is in the cottage just before Martin arrives looking for an explanation, a woman leaves the cottage and walks up to her car. The car's wheel is turned to the right, yet in the following shot from behind Liz, the car's wheel is pointing straight. (Zoom in is required.) (01:00:50)
Continuity mistake: Near the middle of the film when we see the alternate version of events, Frankie answers the phone. Look where her fingers are on the phone in this shot. When the camera cuts to the following shot of Liz drinking out of a bottle, Frankie's fingers on the phone have changed position slightly. (00:42:25)
Continuity mistake: When Liz first meets Dr. Philippa Horwood, they enter a room in the hospital, and Liz goes to a door to have a look inside. When she steps back she is standing next to door and proceeds to close it, yet in the following shot her left arm is outstretched still holding the door. (00:05:30)
Continuity mistake: During the flashback of the true events of what went on in the bunker, Mike and Geoff are trying to get Frankie to have sex with them. When she says "What have you done for me", in one shot she steps away, brushes her hair back, and does a little dance, then in the following shot she does the same thing again. (00:50:35)
Revealing mistake: Just as Liz goes to talk to Mike (where she talks about slitting their wrists with Geoff's knife) Geoff is in the foreground of the shot, covered in a coat/blanket/something, and is supposed to be dead. But you can see his stomach and chest moving as the actor breathes. (01:25:05)