Revealing mistake: In the taxi scene at the end of the movie, the steering wheel turns back and forth but the driver's hands are not moving.
Continuity mistake: When Holly and Paul are at the library viewing Paul's book, Holly encourages Paul to autograph the library's copy of his book. Paul grabs a pen off the library's counter and begins to write in the book, then in the next shot Paul once again takes the pen from the library counter to write in his book.
Revealing mistake: In the opening titles, when Holly looks in the store window, in the background a policeman can be seeing holding up traffic for the filming.
Continuity mistake: In the scene at the apartment, Holly is tossing lettuce in a bowl. Behind her is the stove top, where a pot is resting on an unlit hob, and a yellow bowl is to the right of this. In the next cut, we see a flame burning under what appears to be a different pot and the yellow bowl has moved closer to the said pot.
Visible crew/equipment: Just before Paul sits down on the box in front of Holly to show her the book commission that he had just earned, a microphone flashes into view on the right side of the screen.
Continuity mistake: When Holly gets out of the taxi into the pouring rain to run after Paul, she is soaking wet before her feet hit the sidewalk.