Other mistake: During his conversation with the landlord of the pub he ends up staying in, Sergeant Howie makes it clear that he did not intend to stay on Summerisle overnight, that he had been delayed and so needed accommodation. Makes you wonder why he packed his pyjamas. He's wearing them when Britt Ecklund does her famous naked song and dance routine, and they are not new so we know he didn't buy them that day. When he arrived he didn't even think he'd be on Summerisle for more than a few hours - we don't see him with so much as an overnight bag.
Visible crew/equipment: In the last scene where the main character escapes, he jumps into the bay and is supported by a sack which he is carrying. Actually you can clearly see that he is supported from underneath by a diver.
Other mistake: The reporting of the horse race used to sting Doyle Lonnegan stops as soon as the fake FBI agents raid the bookmakers. J J Singleton, who is reading the results of the race, stops when he sees the raid taking place. However, that was supposed to be a live broadcast from the racetrack itself. It should have continued. Lonnegan isn't stupid - he would pick up on something like that immediately.
Visible crew/equipment: After Callahan removes the bomb from his mailbox, he looks up at a man on the nearby stairs. As a car drives by on the street, the lights from it cast the shadow of the boom operator onto the wall.
Plot hole: Swapping his dental X-ray records with his deceased partner won't convince anyone that Varrick is dead - then (as now) the patient's name appears on the X-ray.
Visible crew/equipment: When 007 takes the taxi outside the Oh Voodoo Cult Shop, you can see the reflection of the crew on the window of the car.
Other mistake: In the intense outdoor battle scene at the end, when Bruce kicks a guy in the face three times in a row, one of the extras in the background cracks up laughing.
Continuity mistake: Close-up interior shots show that Gator's brown Ford has a Hurst floor-shifter and manual transmission. But when he arrives at his parent's home, he very obviously puts the column-mounted automatic shifter into 'Park'. (00:17:10)
Revealing mistake: When the Grand Ville turns onto the street where the children are playing, it clips a parked car as it makes the turn. This is the same car that later gets its driver's door ripped off by the Grand Ville just before the police give chase. It was repainted red for the second scene, but note the same dent in the right fender as before.
Revealing mistake: When the bad sheriff tries to run Buford Pusser over, he drives off the road and the car explodes for no reason. It's in the air when it explodes, there's no way it could have exploded without hitting the ground.
Factual error: The kid is wearing a Texas Rangers baseball cap. The Rangers didn't come to Texas until 1972.
Continuity mistake: When Serpico finds three black men raping a girl in the park, one of them cuts the girls face slightly and the cut is very visible. The camera then cuts away then back and the cut and blood is gone. (00:10:25)
Visible crew/equipment: When Charles Bronson is chasing Paul Koslo through the flea market, the rooftop mounted camera set up can be seen atop the car.
Continuity mistake: During one of the pool scenes, balls disappear and change position between cuts.
Other mistake: Throughout the whole scene when Black Caesar is wounded by the Irish hitman several passers-by can be seen looking directly into the camera, and in many shots people are crowded together on the sidewalk watching the filming. Conversely, the hitman fires a big and loud revolver in the middle of a crossing with dozens of people and cars in close quarters, and nobody bats an eyelid. (00:03:00)
Character mistake: After Clinton's phone call, Christine talks with her assistant and making fun of the "mourning", she says "We went directly to Streisand's opening at the Sands right from the cemetery." However, in Vegas Barbra Streisand never performed at the Sands; she did the International (then Hilton) and the Riviera. (00:05:15)
Continuity mistake: Some scenes show the actresses in their yellow prison dresses getting dirty, yet a minute or so after this, they're clean again.
Continuity mistake: Searching Tom Ferramenti, Rizzo finds brass knuckles and a knife (plus dollars and jewelry). He then puts his hand on Tom's shoulder (he is leaning against the wall with the left). So, all the stuff he confiscated vanished in thin air. And at the first cut, his hand too disappears, being suddenly off Tom's shoulder. (00:36:05)
Revealing mistake: In Maiberra, with the big trucks of the villains loudly traversing at top speed the roads, all the women by the road are facing the opposite direction instead, smiling, and some of them looking into the camera. (00:51:10)
Continuity mistake: For the infamous closing scene, a van of drug-runners fire a double-barrelled 12-gauge shotgun straight into the windscreen of Officer Wintergreen's Electra Glide motorcycle, killing him. In the full front view, the gunfire virtually explodes the windscreen, shattering it on all sides all the way to the frame. Camera cuts to a side view and we see Wintergreen topple off as the motorcycle keeps traveling down the road. In this profile shot, the windscreen is no longer exploded, but now has a neat 4-inch hole in it.
Suggested correction: This isn't a mistake. The person "operating the radio" could easily have switched it off because of the commotion. Lonnegan would simply suppose this is what had happened. He is not going to instantly suspect someone is faking the whole thing.