According to Robert Zemeckis and Bob Gale, the film's release was botched by the studio. The film tested extremely well in previews and Columbia Pictures pushed the film out of its original late-August release date to mid-summer with little publicity and poor advertising. The film only played across half the United States rather than receiving a true wide-theatrical release and consequently flopped upon release.
Zemeckis was walking across the set when he spotted two bikers hanging out with two nuns. He immediately summoned the camera crew and they shot a scene with the bikers walking up and taking hot dogs away from the nuns and the nuns retaliated by grabbing their beers and slamming them down. Normally, production assistants pour out the beer and replace it with water, but, the nuns slammed down actual Coors beer and promptly spit it out. Columbia execs nixed the scene because one of them was a devout Catholic.
According to Kurt Russell on the DVD Commentary, he kept having trouble saying the line "Best salad bar in town: Airport Lanes!". After constantly flubbing the line, Robert Zemeckis had to mouth the line to Russell so he would get it right.
During Luke Fuch's last ride in the Chevy, he tears the shoulder of the driver's Castrol jacket, exposing a patch for his brother's used car lot, which later falls out of his hand as he dies on the floor of his dealership. When the driver hops out of the '57 and makes his escape, though, his Castrol jacket's shoulder is intact and un-ripped.
In the football bar scene before Jeff's arrival you see the salt already spilled and the Lucky Strike packs on the bar that Jeff pulls out of his pocket.
After the car jumps over the train, a camera is visible on the centerline of the road. This camera jammed before the car landed so there was no usable footage from it.
Judge H. H. Harrison: I know you're seeing the same thing with those beady little eyes I'm seeing, Mr. Slaton. That sure does look like a mile of cars to me.