Continuity mistake: When Sheriff Justice tries to drive off while on top of the jack (at the gas station), his car falls off the jack, as he hits the red car in front of him, in the car's rear quarter, spinning it around. In the next shot of Buford, the red car is back to its original position, with Buford's car on top of the red car's roof.
Continuity mistake: While at the truck stop to refuel, the Bandit talks to Justice on the CB. During this scene, Justice is having his car worked on the front is up on a jack. When the bandit drives by them to leave, you can see Junior is wide awake (in fact, his head turns to look at the car) and then immediately in the next shot he is sleeping.
Revealing mistake: When Frog makes her "We're going 110." comment, they then show a close-up of the dash-board. Even though the speedometer does show them to be going 110 miles/hr, the ignition key is in the 'off' position, and the 'amp' gauge shows '0'. This is a clear indication that the engine was not actually running during this shot.
Continuity mistake: In different scenes the rear view mirror is shown and then it is gone. This happens several times throughout the movie.
Factual error: When the Snowman is figuring out their schedule and he is typing on the calculator, you can clearly see that it's off.
Revealing mistake: When Frog says "We're going 110" she's misreading the speedometer. It shows that they're going 110 kilometers/hr, which is 70 miles/hr. Also, the ignition is turned off and the oil pressure and temperature gauges read far lower than they would if the car was actually going 70mph. There's also far too much dust on the dash and gauges for a brand new car that hasn't been on any dirt roads yet.
Continuity mistake: Sheriff Buford T Justice was supposed to be from Texas, but right as they start trying to find Frog (and before they caught up with Bandit), he passes an interstate sign with Georgia on it. If they were really in Georgia, that would have been one quick trip from Texarkana, and less than 60 miles to Atlanta.
Continuity mistake: At the end of the movie when Bandit, Frog, and Cledus are sitting in Big Enos' red Cadillac talking on the radio to Buford T Justice, a green Cadillac, which has been seen several times during the movie, is seen parked in the upper right portion of the screen. When Bandit pulls out on his way to Boston for clam chowder, Buford takes off chasing him and the green Cadillac is no longer there.
Factual error: After the scene where Snowman is trying to leave a written note for the beer warehouse staff (and then throws his notepad away), Bandit's CB radio is shown receiving a signal and Bandit changing the channel, however, the radio is not powered on as the signal meter needle does not swing out, nor are the signal meter light, channel indicator light or receiving LED (yellow on this radio model) illuminated.
Continuity mistake: In the scenes where Sally Fields is removing her wedding dress and veil and throws them out of the car you watch the veil leave the car and fly away, in the very next scene the veil is back inside the car as she struggles to get it to fly out of the car again, as it is caught on the t-top.
Revealing mistake: In the chase scene with the cop taking a "10-100," the patrol car loses control and goes backwards into a lake. But if you look closely as it plunges in, you can see the backup lights lit, which is impossible if the car was in drive.
Visible crew/equipment: When Snowman is pulled over by "Mr. Evil Knievel" (the cop) two lighting reflections can be seen in his helmet.
Audio problem: The section of sound effects used as the Trans-Am and the big-rig pull up to the warehouse to get the beer is exactly the same 'loop' as the effects used when the Trans-Am and the big-rig stop by the pond to give 'Fred' his burgers for lunch. Specifically, the Trans-Am's engine idling down to a stop, then the T/A's door closing, then the big-rig's air brakes squealing a very distinctive sound and finally the big-rig's engine rattling to a stop. Exact same 'loop' both times.
Character mistake: In the scene where the Bandit convinces Snowman to go with him to Texarkana, Texas, to get the beer, he says, "It's only 900 miles there and 900 miles back." In fact, it is only 557 miles between Texarkana and Atlanta, meaning they could cover the 1114-mile round trip in the pre-determined 28 hours in an average speed of 40 mph.