Revealing mistake: When Marin and Jack Nicholson first enter her mother's house, Marin is wearing white pants, and it is noticeable that she has a thong on. When she gets into bed with Jack, she is in full underwear.
Revealing mistake: Right before Jack Nicholson sees Diane Keaton naked, there are shots of Keaton getting undressed. There is a close up of swollen feet that you can see are obviously not Diane Keaton's. The far shot shows her with smaller feet and legs.
Continuity mistake: When Erica and Harry are having a picnic at the beach, they go for a little walk and it starts raining. They hurry back into the house and, the first time they are seen in close shots, they're absolutely dry. A couple of seconds later, in other two different close ups, they appear to be soaking wet.
Continuity mistake: In the scene where Jack and Diane kiss, two of the shots do not correspond. In the first shot, Diane is holding Jack's cheeks; in the second, she is hugging him.
Continuity mistake: In the scene where Jack confronts Diane in the Paris restaurant, his scarf is knotted at the neck. Next scene, it is unknotted. Then, knotted again for the rest of the scene.
Continuity mistake: When Erica and Harry are walking on the beach you can see a shadow behind them several times.
Revealing mistake: In the scene where Harry and Erica are walking on the beach, Harry bends down and supposedly picks up a black rock to give to Erica. However, the viewer can see Harry take an object out from his left pocket and, while concealing it with his left hand, transfer it over to his right hand as he bends down and pretends to pick up the rock from the beach.
Continuity mistake: When Erica and Harry take their first walk on the beach, Erica reaches down to pick up a white stone. When the shot changes and Erica stands up straight again having picked up the stone, all the sand in front of them is dry. However, in the shot just prior to her picking up the stone, the sand is actually wet from the seawater.
Continuity mistake: When Jack Nicholson and Diane Keaton are in the kitchen and Diane is making pancakes, she is talking to Jack and holding the milk. She pours some milk in the bowl and puts the cap back on while she is talking then the shot switches to Jack and back to Diane and she puts the cap back on the milk a second time.
Revealing mistake: In the scene where Jack Nicholson leaves the Hamptons hospital and collapses in the parking lot, a palm tree can be seen in the background. There are no palm trees on Long Island.
Continuity mistake: In the scene at Le Grand Colbert restaurant in France, Diane Keaton lights a cigarette and takes a hit. In the next shot the cigarette isn't lit at all, and in the next shot it's lit again.
Continuity mistake: Marin takes off her white pants for Harry. They go into the bedroom and talk. After Harry tells Marin to change into her swimsuit, she laughs, gets up, and in the process reveals that she is wearing dark coloured pants. (00:05:35)
Continuity mistake: In the scene where Harry and Erica are walking on the beach. There is a dark grey house with a brick chimney in the background directly above and behind Harry's right shoulder. As they continue to walk, the house in the background continually moves farther away and closer in almost every different shot of them talking. In some shots you will see them far away from the house, then seconds later you see them very close to the house.
Continuity mistake: When Harry and Erica are talking outside the restaurant, Erica has a cellphone in her hand when she is shown from the front but every time the shot changes to her back the cellphone disappears.
Continuity mistake: In Paris, when Erica is smoking, she lights the cigarette, than lights it again, than places a whole new one in her mouth.
Continuity mistake: When Harry, Erica, and Marin are in the grocery store, the size of Harry's ice cream cone changes. In the first clip, he is eating the ice cream off the top of the cone. The next few scenes, ice cream appears at the top of the cone again in varying sizes.
Continuity mistake: In the scene where Erica and Zoe are in the kitchen and start hearing music, Zoe starts a mock calling, moving both her hands, in the shot from the front both her hands are empty the shot changes to her back and she has a glass in her hand.
Other mistake: Harry (Jack Nicholson) tells Erica (Diane Keaton) that he only sees her in turtleneck tops. However, when he first meets Erica and Zoe in Erica's kitchen, she is wearing a scoop neck.
Continuity mistake: In the scene of the freeze, where Erica and Harry first meet, see Marin's hair on her forehead change several times during close-ups.
Continuity mistake: When Keaton and Nicholson argue outside the restaurant and Keaton confesses she is in love with him, in certain closeups Keaton holds her head with both hands. When the camera cuts to Nicholson's face, you see her back and her arms are down. This happens twice during the scene.
Answer: This sounds like it could an editing issue. Movies often film multiple scenes that, for whatever reason, are later deleted, but sometimes portions of those scenes are compressed into one sequence, even though there are obvious inconsistencies like wardrobe gaffs.
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