Continuity: In the scene when Jamie Lee Curtis brings Dan Aykroyd home, you can visibly see she is wearing pantyhose. However, just a few second later, inside the apartment, she takes off her dress and is only wearing panties.

Continuity: At the start when Billy Ray (Murphy) is backing away from the cops after he was pretending to be a cripple, he passes the Heritage club. In front of the steps of the Club, he turns to face the other way. The camera changes angle as Billy Ray completes his 180 turn, but he is now no longer at the steps of the Heritage club, but about 10 feet beyond it, nearer to where the other cops in the patrol car come out of the alley way.

Continuity: When Louie is released from jail his hair is sticking up all wild, then it's flat, then it's all wild again.

Audio problem: When Valentine, and Winthorpe, are sitting in the living room you hear them talking but you can barely hear the TV. But as soon as Clarence Beaks' name is mentioned on the TV, all of a sudden the volume goes up without anyone touching a button.

Continuity: When Valentine (Murphy) and Winthorpe (Aykroyd) are at Winthorpe's house at the end of the movie. Winthorpe is on the floor cleaning his gun. In the next scene Ophelia (Jamie Lee Curtis) points out Beeks on TV and Valentine and Winthorpe jump up from the couch when Winthorpe should have been and was on the floor.

Factual error: The Amtrak Metroliner has open passenger coaches, not the European-style compartments as seen in the movie.

Continuity: In the very last scene, Eddy Murphy is on the beach, and Dan Ackroyd, with Jamie Lee Curtis is on a yacht. They exchange what are now classic lines: "Looking good, Billy Ray!" "Feeling good, Louis!" But the yacht is way off shore. There's no way they could hear each other at such a distance, even at the loud voice that we as viewers hear.

Continuity: While Winthorpe is dressed up in the Santa outfit, his wig constantly changes from white to a silverish colour, and then back again.

Continuity: When Valentine is in the limousine with Mortimer and Randolph his left hand has a bunch of cigars in it. The position of those cigars change from shot to shot. One is hanging down very low when looked at from Randolph's side of the car then immediately is even with the others when looked at from Mortimer's side of the car.

Continuity: When Valentine goes into his new house and is being shown around, he puts about four things in his pockets. But when Mortimer Duke pulls these items out, he pulls only two, and they're not the same things that were actually put in.

Continuity: When Dan Aykroyd tries to strangle Eddie Murphy and the shot changes to a close-up of Dan, you can see that he is not holding on to Eddie's throat but just holds them in the air.

Deliberate "mistake": Eddie Murphy is giving his first party and tells everyone to leave. The valet holds all the coats in a perfect pile for the people to grab them as they leave. Although everyone rushes out of the party, it's very strange that the first person to leave takes the first coat, the second person the second coat and so on until the very last guest. No one stops to check if the coat they're taking is really theirs. (I guess it was shot this way to keep the good pace of the sequence).

Continuity: While Billy Ray is outside the heritage club "Stealing" the briefcase, his trainers change colour from black to white.

Other: At the start of the movie it shows the house at front view and the sky is very very grey, it looks like it's about to rain, then after a short scene inside the house it goes back outside and the sky is clearly blue with not a cloud in sight.

Continuity: In the scene at which Dan Aykroyd first joins his employers at the gentleman's club, Don Ameche is shown mirror image. This same scene is repeated at the very end during Ameche's credit.

Other: After Winthorpe exits the bus and is wearing his Santa outfit, a dog urinates on his leg. Not only is there no "stream" of urine from the dog, but there also is no evidence of urine on the ground after the dog finishes his business and trots along.

Continuity: When the cops are dealing with Eddie, the positions change. In one frame they are standing closer together, in another frame their arms change.