Just after George gets the rest of the money he needs at the end of the movie, Kuni repeatedly moves from setting off the switch on the fireworks to standing with the rest of the crowd between shots.
When R.J. Fletcher meets Harvey Bilchik at the airport to close the business deal, R.J. puts the briefcase on the back end of the limo. When the limo drives off, the briefcase is nowhere to be found. R.J. is holding it in the next shot.
When Stanley Spadowski is tied up in the broom closet and realizes his beloved mop is in the room with the thugs, an orange bandanna is around his neck. When he breaks free of his ropes and jumps out of the broom closet, the bandanna disappears.
When interviewing the shop teacher, the amount of blood on
George's shirt changes from shot to shot after being sprayed by the stump.
A TV commercial for "Conan the Librarian" says the program airs at 7:30pm. A few scenes later, George sets up the Fall UHF lineup on a magnetic board, which shows Stanley Spadowski's Club House airing every day from 7:00pm to 8:00pm.
During the Rambo sequence, George catches the entire .45 cartridge with his teeth. When a cartridge is fired, only the bullet portion is propelled. The shell is either ejected (as would be with the semi-automatic .45 1911) or kept in the cylinder (if it were a revolver).
If George and Harvey were legitimately selling stock in the station, the legal proceedings alone to register the stock shares and have what is essentially an IPO would take more than two days to complete.
Following R.J. Fletcher's rant against the community, which Philo had secretly recorded and then put on the air by overriding Channel 8's signal, an official from the FCC confronts Fletcher and revokes his station's license. In reality, the government would have taken the same action against Channel 62 for the serious crime of hijacking a broadcast signal.
During the Rambo sequence, George's M-60 has no ammunition loaded. It takes place in George's imagination, so it doesn't have to follow logic.
The "Save Our Station" clock, which appears to be fully functional, has almost 75 tick marks. It could be a deliberate error.
In the opening moments, a bad guy draws a gun with his left hand to shoot Weird Al in the back. Weird Al suddenly wheels around, takes his whip, and severs the bad guy's arm. In the next shot, the bad guy's right arm is lying on the ground. This error occurs during a fantasy sequence and also, given the film's satirical nature, is likely intentional.
During Pamela's live report with the mayor, the live truck is missing and Noodles's camera doesn't have cables or a power supply.
When Joe Earley cuts off his thumb with the table saw, you can see his actual thumb bent under his left hand for a second, and see the tube of blood going up inside his left sleeve.
When Joe Earley loses his thumb in the table saw and lifts his arm to examine the wound, his thumb is briefly visible, bent underneath his hand.
George asks what time it is, but a clock is on the wall right in front of him. He waits until the martial arts student punches through the wall to read his watch.
In the helicopter scene, the number 8 on R.J.'s Channel 8 helmet is clearly made from cut up electrical or gaffer tape.
In a shot of the apartment from outside, a car drives in front of the camera. The camera, camera operator, and offstage actors are reflected in the side of the car.
Harvey goes to the airport to fly into the city to meet R.J. Early in the film, Harvey's house is in the city, and George comes to the party still wearing his Burger World uniform. Footage shows the same house in both cases.
Since George's uncle valued the station at $75,000, George essentially sells off 100% of the station in the form of stock. If R.J. got intermediaries to quietly buy a controlling interest, he could shut the station down and save some money. As a cutthroat businessman, he should've realized that immediately.
The Bum tells Fletcher that the penny he gave him was a 1955 doubled-die Denver mint penny. The 1955 doubled-die cent was made in Philadelphia, not Denver.