Continuity mistake: When Frank is in his apartment and when Jane leaves Frank is facing toward the fridge but the next shot of him his back is facing the fridge. (00:51:40)
Revealing mistake: When the window slams on Nordberg's hand it is that the window stops right above his hand. When he pulls his hand out the window doesn't go all the way down and a wooden cube is visible on the edge of the window stopping it from closing. (00:06:50)
Continuity mistake: In the scene where Frank is in the driving school car chasing the doctor, right after Frank says, "I know a shortcut. Turn left here", we see two brief shots of the doctor's car, one from the inside of the car and the other from the outside as he is turning around a corner. In both shots the rear window is shattered. However, it is only four shots later that Frank shoots at the doctor's car, shattering the then intact rear window. (00:31:45)
Continuity mistake: In the beginning of the movie, during the big fight, Frank grabs Mikhail Gorbachev and smashes his head through the wall. The guy stays there but at the end of the fight, when Frank is about to jump out of the window, it shows him again. The hole now is bigger and not only consumes his head but all the way to his waist. (00:02:15)
Continuity mistake: When the "I LUV YOU" picture is viewed in Nordberg's hospital room, the photo has a vertical/portrait orientation. When Frank shows the picture to Jane, the photo has a horizontal/landscape orientation. (00:12:50 - 00:38:25)
Visible crew/equipment: When Drebin chases the doctor out of the hospital, the doctor gets a car, while in the background, Drebin falls from the ladder. Drebin then emerges from under the car. The doctor drives off, and Drebin enters the foreground. Look in the windscreen of the car Drebin emerged from. The top of a man's head with grey hair appears at the end of the shot, thinking it's over. This is the stunt double that dropped from the ladder. (00:32:25)
Revealing mistake: During the car chase, the doc's (already busted) car collides with a missile transporter. The explosion occurs just before the car impacts with the vehicle, and looks more like the burst of a flame thrower than a real explosion. (00:34:25)
Continuity mistake: When Frank does his speech at the end, his chest protecter goes from being wrinkled and squished in one shot, to perfect condition in another, and then back to wrinkled again in the next. (01:17:30)
Continuity mistake: When Ludwig picks up his gold box you see him holding the box in different ways between the shots. (00:20:10)
Continuity mistake: When Ludwig demonstrates the hypnosis effect with his secretary, she drops her revolver near the door. When Ludwig picks it up, it's several feet away, near his desk.
Continuity mistake: In Ludwig's office, when Papshmir is with him, you see a wide shot of Ludwig's desk and you can see a small remote control. When it cuts to Ludwig picking up the remote, another item appears beside the remote. (00:27:55 - 00:28:40)
Continuity mistake: When Frank sits down on Nordberg's hospital bed and the bed breaks up you see three tubes on Nordberg's chest. When it cuts an extra tube appears on Nordberg's shoulders. (00:10:05)
Factual error: In the scene where Frank is in the car, and the Doctor shoots at them, the windshield breaks right out and pieces fly all over Stephanie (the driver). This could only happen with a window made of something like plate glass. All windshields since before the 1940's have been made of a glass that will not break as a plate glass window does, so the bullet should go through the glass and just leave a little hole with cracks all around it. (00:33:15)
Visible crew/equipment: The crew is reflected on the side of the Taurus, when it tries to stop before hitting the petrol tanker. (00:34:25)
Factual error: Frank hits some garbage cans with his car and the air bags deploy. He gets out of the car and another air bag deploys underneath the steering column and pushes up on the automatic gear shifter, which presumably makes the car start rolling. If the engine is off, a car will roll with the shifter in any position except park. Therefore, the shifter had to be in park when he got out, so pushing up on the shifter would not make it roll. (00:25:20)
Visible crew/equipment: When Frank Drebbin opens the car door, it is blocked by a big pile of peanut shells. You can see two large rectangular stage lights in the reflection of the car door. (00:42:15)
Revealing mistake: When the Queen throws the first ball at the baseball game, if you look closely you can see the string which made the ball do its loops. (01:03:30)
Continuity mistake: When Ed and Frank drive up to the Police Station, they are towing a luggage trailer that Frank backed into at the airport that didn't have any signage on it, but now sports a "DynAir" placard.
Continuity mistake: When Nordberg is at the I Luv You, the "u" in "You" is partially faded. When Nordberg's wife hands Frank the photo of the ship, the letter is fully visible.
Continuity mistake: After Frank commandeers the driving instructor's car for a chase, the woman learning to drive is faced with an oncoming truck. In one shot, the instructor has glass all over him, but in the next shot of him, the glass is all gone. (00:33:30)
