Continuity mistake: At one point in the film, the wingspan of Q is mentioned. Later on, its length is mentioned. The monster is twenty feet longer than its wingspan.
Continuity mistake: When Ken Wahl is skiing down the mountain being chased, does the jump and twist at the bottom of the mountain and shoots the guy. The guy is in midair when he gets shot and he has his skis on but when he hits the ground the skis are nowhere in sight.
Continuity mistake: When Burt Reynolds and Goldie Hawn are left alone to write the final scene to a movie, Goldie says she needs air, so Burt takes a trash can and breaks out a window. In the next shot, more of the window is broken out than was shown previously.
Continuity mistake: In the scene where Victoria is watching man eat a cream cake, the man has cream on his nose but in a different shot he has none.
Continuity mistake: Near the end of the film when Jessica Lange, playing Frances Farmer, runs away from her parents' home in Seattle, Washington and takes on the life of a vagrant. She is seen hitchhiking on a road, which is obviously adjacent to a desert and looks very much like southern California. When the police pick her up and drive her back home, in what seems like a short period of time, she is transported back to the Seattle landscape surrounding her parents' home.
Continuity mistake: When Trash shoots the bounty hunter with the grappling hook, he shoots it at his stomach. After he ties it to the bike and drives off dragging the bounty hunter, the hook is now in his back.
Continuity mistake: As Garp is being placed aboard the helicopter, the rotor motor can be heard spinning, but there is no downdraft affecting the people in the scene.
Continuity mistake: In the very last scene of the film Paul Newman ignores the ringing phone with Charlotte Rampling on the other end. A wide shot shows a paper coffee cup is on a table to his right, in front of the plastic lid. In close up, he reaches right, picks up the cup from out of shot, drinks from it and, judging by his arm positioning, puts the cup back in the same place. The next, and final, shot of the film is wider angle again. The lid is there, but the cup is now missing.
Continuity mistake: When Kenny Rogers gets trapped in the rest room at the beginning of the film, he pulls the knob out from the door. When this happens, the knob is on the left side of the door from his point of view. After he climbs out the window, the door has changed to having the hinges on that side and the style of the door does not look like it has a knob at all. A rest room this size would only have one door, so it has to be the same door.
Continuity mistake: When the kids are in their room, the paint brushes come flying out of the red and green cans, but as the brushes are painting on the wall, they are both covered with only red paint.
Continuity mistake: When "Bruce Lee" is fighting the bad guys after he catches the poker cheater, there are multiple continuity mistakes; the bad guys are knocked atop the tables in the room but they disappear and reappear from those tables between shots.
Continuity mistake: In the scene just before the snowman comes to life, the clock in the hallway reads midnight. But a little later, when he is showing the snowman around the house and he is about to lead him upstairs, the clock reads 8:05.
Continuity mistake: Myra Bruhl is popping pills at the beginning of the movie; when she puts down the container, there's a white-labeled bottle on the bedstand that was not there before. (00:02:40)
Continuity mistake: When Dan and Allison are in bed and they finish kissing, you can see their bare chests and shoulders and the sheet is around their waist. In the next shot of them, the sheet is over Dan's shoulder and when he rolls over, the sheet is covering Allison's chest, before she pulls it up.
Continuity mistake: Paul Kersey boards a bus where the line number reads 990. When he gets off, the number is 99. He could not have changed buses because the number of the bus itself remains 8027 throughout. (00:54:50)
Continuity mistake: In the prologue, the boss of the bad guys approaches the window. Notice the tree casting a large shadow. He whispers "Jessie, try the door", and in this close-up there's a lot of light and it's his hand and head to cast a shadow on the wall. (00:03:15)
Continuity mistake: John is helping Mr. Nardini at the beginning of the movie. The box breaks right away and spills its content on the doorsteps, and the various items (pay attention to the blue bags of pasta for instance) shift position at every cut. (00:03:50)
Continuity mistake: Near the beginning when the guy is robbing the liquor store, he's holding his gun with one hand. In the next shot, he's holding it with two hands.