Will

Continuity mistake: While the Alien is bursting out of Kane's chest, notice how the blood stain on his shirt changes in size from a large stain to a small one and finally back to a large one. (00:56:00)

Will

Continuity mistake: While Parker is decapitating Ash with the fire extinguisher his T-shirt is not torn, just after he says "Ash is a goddamn robot" his T-shirt is now torn and held together with a safety pin. (01:23:20)

Will

Continuity mistake: When Sgt Howie is unable to start the plane, he calls the harbour master. While the harbour master is rowing back he calls out to Sgt Howie "what's the matter, won't she go?" Notice that when he begins this question he is nowhere near the plane, but as he is finishing the question, he is now alongside the plane.

Will

Continuity mistake: While Linden is in Mary's room for the last time, he is right up close to Mary and tries to kiss her, but after she screams (after having seen the ghoulish figure) he is several feet away from her.

Will

Continuity mistake: When Mary leaves the boarding house, she puts her luggage and jacket on the back seat of the car, but moments later when the car does a right turn, the jacket is hanging up in the back of the car, but when she drives the car into the garage, the coat is no longer hanging up in the back of the car.

Will

Continuity mistake: Mary puts her suitcase on the bed and opens it - there are two straps on the left half of the suitcase, she sees the ghoulish face at the window, as she moves towards the window the straps on the suitcase are now on the right half of the suitcase.

Will

Continuity mistake: Mary gets out of her car at the gas station wearing white shoes, but when she is being shown her room at the boarding house by Mrs Thomas she is wearing black shoes. This also happens at other times during the film, where Mary's shoes change from white to black and vice-versa.

Will

Continuity mistake: Norman brings a tray of food to Marion, when she says "So long as you've fixed supper we may as well eat it," watch how her folded arms change position from hands tucked underneath, to hands on top of her arms.

Will

Continuity mistake: When Marion arrives at the Bates motel, she sounds the car horn for the first time, the windscreen wipers are switched on. She gets out of the car, looks towards the old house, then goes back to the car, as she sounds the horn for the second time the windscreen wipers are now switched off.

Will