Continuity mistake: When out at a pub, Allen finds himself laying on the bar, and his brother Freddie starts to talk to him. Between shots Freddies glass goes from being on the bar to in his hand. (00:13:15)
Continuity mistake: When at the bar, Allen makes a woman spill drink on her dress, and she walks off. Between shots the bartender picks up her glass and starts to wipe the table twice. (00:14:45)
Continuity mistake: When Tom Hanks is in the dinghy by himself, the outboard motor has no cover. He falls into the water and the dinghy circles him several times. One of the shots shows the motor with its cover in place. (It is an Evinrude motor). (00:22:15)
Visible crew/equipment: When Madison enters Bloomingdales, you can see the reflection of Ron Howard in one of the mirrors. (00:37:45)
Audio problem: After leaving Bloomingdales, Allen and Madison start talking. Allen says to her "Just begin when you were born and finish up right when you blew up the TV's." His mouth doesn't move at all when this is said. (00:41:15)
Continuity mistake: When Allen and Madison are walking along, they pass a preztel stand, and you can see a woman walk past the stand and look at it. In the next shot there is nobody at the pretzel stand. (00:43:50)
Suggested correction: You see the woman walking along just past the pretzel stand and beyond as the camera pans up.
Continuity mistake: When Madison is taking a bath, she dips her head right under the water. Then when she gets out, her hair is soaking, but in seconds, her hair becomes very dry. (00:46:50 - 00:48:30)
Visible crew/equipment: When Walter Kornbluth rolls down the stairs with the fire hose wrapped around him, to the left of the screen you can see crew equipment come into the screen, then go back out. (01:11:40)
Revealing mistake: When the TVs explode, the glass is very fake and "cardboardy".
Continuity mistake: The Vista logo on Allen's credit card disappears.
Continuity mistake: When Tom Hanks stabs Eugene Levy with a needle in the dentist's office, Levy is not wearing a bib. When Levy sits in the chair, he has a bib on. Then when he gets up, the bib is gone.
Revealing mistake: Madison is wearing jeans as she walks towards the group of tourists although she's supposed to be naked.
Revealing mistake: When Allen is in the park and drives backwards to avoid the MPs, there's a closeup where the pigeons fly backwards, revealing the angle is the previous one with the birds taking off but played backwards.
Other mistake: When she breaks the TV's with her "voice" they pan to the salesmen. The glass display case is intact. Had her pitch actually been able to break glass the display case would have gone as well.
Continuity mistake: When Allen tells his secretary that his father passed away, she is either holding the note from the side or from the top, depending on the angle.
Revealing mistake: When Hanks drives through the city escaping form the MPs, the guy driving is a very obvious stuntman.
Continuity mistake: When the mermaid rescues Allen after the boating accident, the amount of sand on Allen's face changes from the whole side of his face to just his chin to hardly any sand at all. This goes on for the whole scene.
Continuity mistake: When Madison is taking a bath in Allen's apartment, she starts the water and then as the camera pans around her, all of a sudden the big tub is full.
Factual error: When the TV store is closing at Bloomingdale's, The Richard Simmons Show is shown on the monitors. In 1984, when the film is set, this show was broadcast only in the morning and was not released in syndication. The show would therefore not have been playing on a television channel in New York City in the late evening.
Plot hole: Why would Madison take a bath in steaming hot water? The ocean water is warm or cold depending on the area of the ocean. So, it makes no sense as to why she does this.
