Continuity mistake: After tennis, when Annie is driving Alvy uptown in her VW, she spots a parking space on the street and quickly pulls in behind a parked, driverless, red station wagon. Immediately, in the next shot, as they are opening the car doors to get out, they are behind a blue car. (00:27:25)
Visible crew/equipment: At the very beginning of the scene where Alvy and Annie are arguing over Annie's adult education teacher, David, and Annie is getting into the cab, a film crew member is visible up the sidewalk, just above the roof of the cab. As the scene starts, he drops his arm as a timing signal to the old woman carrying a grocery bag to begin her walk into the scene, where, seconds later, Alvy turns to ask her a question. (00:52:25)
Other mistake: In the end credits, Christopher Walken's name is listed as 'Christopher Wlaken'.
Factual error: When Alvy and Annie try to get the escaped lobsters into the pot, the lobsters are red and orange. Live lobsters are dark green and black - they turn red/orange after being boiled.
Continuity mistake: Alvy and Max are walking down the street talking about (among other things) the fact that Alvy is on his way to meet Annie at the Beekman Theater. Alvy is wearing a black or navy blue T-shirt under his button-down flannel shirt. Shortly afterwards, when he's waiting in front of the theater, he's wearing the same clothes, but the T-shirt is now gray.
Visible crew/equipment: When Annie is talking with Alvy in the Los Angeles vegetarian terrace, crew members and lights are reflected on her sunglasses.
Continuity mistake: The day Annie and Alvy first meet, she drives him in her car. From their POV they're about to crash against a truck, but the next shot shows them driving straight. No sign of swerving to avoid the crash of the truck.