Continuity mistake: In the first shot of the movie there's an equipment shadow on the door of the police car as the policeman opens it. (00:01:30)
Continuity mistake: As Miles walks from the train in the long shot he gets money from his pocket with his right hand and is carrying his coat with his left. In the close-up we see he's holding the coat differently and has the money in his left hand. (00:02:50)
Continuity mistake: As Miles and Sally drive away from the train station her hand is resting on the passenger side window. In the very next shot her hand is by her side. (00:03:40)
Continuity mistake: As Miles slams on the brakes so that he won't hit Jimmy Grimaldi Sally is seated to the left of him in the passenger seat. In the shot from the front she's seated in the middle of this seat behind the rearview mirror. (00:04:15)
Continuity mistake: Miles' car is parked very close to the white car, but in the shot of uncle Ira mowing his lawn it's not there. (00:12:45 - 00:14:10)
Continuity mistake: As Miles begins to talk to the doctors in the restaurant parking lot he's leaning into the car. In the next close up shot his position has changed and he's not leaning into the car. (00:15:35)
Continuity mistake: After they find and fingerprint the alien body on the pool table, Jack starts out holding the piece of paper with the blank fingerprints on it in both hands. In the next shot he's holding his pipe in his right hand. (00:21:35)
Continuity mistake: As Miles wonders why the body is in the house, Jack goes from looking at Miles to looking at the body between shots. (00:23:30)
Continuity mistake: It's supposed to be a duplicate, but the cut on the body that's on the pool table's hand is in a different position that when we first see it on Jack's hand in the earlier scene. (00:25:50)
Continuity mistake: In Becky's basement Miles lets the match that he lights burn right up to his fingertips but when he puts it out the light remains on him for one or two seconds more. (00:29:50)
Continuity mistake: In Miles' kitchen, Becky never turns the stove on to boil the eggs. The burners are not on and when she comes back from looking in the basement she moves to turn the stove off. (00:36:30)
Continuity mistake: On top of Miles' stove when we first see the coffee in the coffee pot its three quarters full. Later we see it again while Becky is poring Jack a cup of coffee and there's less and she didn't touch it. (00:36:55)