Continuity mistake: When Meg Ryan walks home from the lighthouse she is barefoot. As she approaches her apartment the camera shot is from overhead as she walks through her garden. From this view she is wearing sandals (same sandals she is wearing through most of the film, although during this particular costume change she wore heels before going barefoot). The next scene shows her entering her apartment, she is barefoot again.
Add timeFrau Blucher
Continuity mistake: In the scene where Frannie and Detective Malloy are standing outside the police car, after Frannie was picked up by the two police officers, outside her apartment, you can see a girl with a white shirt with black sleeves and a very short skirt passing by. After a few seconds, Detective Malloy goes back into the car and you can see the exact same girl passing by at the same direction as before and she even wears the exact same clothes.
Factual error: In the scene where Meg Ryan and her sister are in the coffee shop, her sister calls to the waitress that they ordered a latte, no foam, very dry - it is impossible to make a dry latte without foam, because dry means "foamy." Not to mention, a very dry latte is technically a cappuccino.