When George is working on the truck with the kids, Al is tightening the air filter cover. Just before Al runs away mad, there is a shot of the fully tightened air filter cover. Later, when the FBI guy looks at it, the cover is off and you can see the filter on its tray.
During the Doc's "sleep better tonight" tirade at the bar, there is a beer glass in his foreground, even though he smashed them all with his mug. Also it doesn't show in the reverse angle.
When Lace has finished shaving George, the foam on George's neck alters several times.
George's position relative to the line on the road when he falls after being struck by the light for the first time.
George is driving over to Lace's house to give her more tomatoes when he sees her two children in a field walking home. They come up to George's tow truck and both hanging on the passenger side window when George offers them a ride. They daughter comes into the cab as seen from George's POV. Then the camera POV changes to about 20-30 feet from the rear of the truck. Both children are now outside the truck, opening the door and get in the cab of the truck in the conventional way. There is a postscript.
Early in the film, George talks to the two children who are in their mother's pick-up truck parked on the street, with the boy sitting in the driver's seat pretending he's driving. George asks the boy to "Pop the hood", which is followed by the sound of the hood latch being released as though the boy did indeed release the hood from the driver's position. This is impossible, as vehicles of that pick-up truck's vintage (late '50's) did not have hood releases located inside the vehicle. Instead, the hood release lever was activated by reaching through the grill on the front of the vehicle.
The signals George intercepts are not high speed Morse signals as he pretended but simple old-fashioned telex transmissions.
It appears that just after George (John Travolta) gets zapped he returns to the bar to finish a game of chess. He moves his queen and his opponent makes two moves off screen. The two views of the board show they were a rook and knight move. However, the claim was a queen capture. In fact, no player was in position to get the queen...however the opponent's first move could have been with the knight followed by George moving his queen to the white square in front of the king. Then the rook could capture the queen.
Early in the film, George talks to the two children who are in their mother's pick-up truck parked on the street, with the boy sitting in the driver's seat pretending he's driving. George asks the boy to "Pop the hood", which is followed by the sound of the hood latch being released as though the boy did indeed release the hood from the driver's position. This is impossible, as vehicles of that pick-up truck's vintage (late '50's) did not have hood releases located inside the vehicle. Instead, the hood release lever was activated by reaching through the grill on the front of the vehicle.
When George uses the tape recorder to record the Morse code signals, there's no tape in the recorder.
George is spinning the sunglasses for everyone to see when the TV reporter asks his cameraman if he's "getting this." Camera man gives a thumbs up, however, his camera view is partially obscured by a guy in a brown coat. If the camera is actually pointed to the sunglasses (to a table that is thigh-high), the view would have been obscured even more.
When George opens the gates to his garden to let the rabbit out, there is more than enough room under each gate for a rabbit to enter or leave his garden at will.
When Nate is shown calling "CQ" (a general call for any amateur) for Diana Ross on the 30 meter band (10.135 mHz), Voice (phone) emissions are prohibited on that band - only Digital emissions (Morse code {CW}, RadioTeletype {RTTY} or Packet) are allowed on that band.