Continuity mistake: When Fletch and Stanwyk first meet and Stanwyk asks Fletch to come to his home and hear his proposal, Stanwyk is wearing a suit/tie on top but is wearing jeans on the bottom. In the next wide shot as they leave the beach, and again in the next scene as they arrive at Stanwyk's house, he is wearing suit pants. (00:04:50)
Continuity mistake: After a long car chase about mid-way through the film, the camera pans over the highway littered with smashed cars and hundreds of cars piled up. In the middle of this, you see a van painted a little like the Partridge Family bus....definately a one of a kind van. Then you see footage of the car which escaped the chase going down an empty side street and passes the same van. No way there are two vans like this one.
Audio problem: In the beginning of the movie when Clark is preparing to light the Bar-B-Q, He squirts charcoal fluid out of a plastic bottle. Then Ellen squirts more fluid onto the coals out of the same plastic bottle. Listen to the sound; it is the distinctive sound of a metal charcoal lighter fluid bottle. (00:07:45)Robert Sullinger
Revealing mistake: When Hightower throws the football to the hood, the hood flies back to hit the door. After he hits it, you can see the black wire that pulled him.
Continuity mistake: When Kersey goes into the post office and his girl is waiting in the car, Fraker and his goon knock her out and shove the car down the hill. As it goes down there is a view of the back of the car and the reverse lights are on. Then as it is about to hit the other car, the lights are now off.
Factual error: There's a couple of scenes where Izzy goes into a speech about how he came to America when he was 10, and he owes so much to that country. The historical Izzy Einstein came to America when he was 15.
Continuity mistake: About one hour in, Maerose is sitting at the table talking to her father. Every shot from the front shows her with her right arm across her body, but every shot from the rear shows her arm forward on the table.