Harry: Erica, you are a woman to love.
Julian Mercer: You know what Freud said they are no accidents.
Harry: Trust me this was an accident.
Directed by: Nancy Meyers
Starring: Keanu Reeves, Jack Nicholson, Diane Keaton, Frances McDormand, Jon Favreau, Amanda Peet
Harry: Erica, you are a woman to love.
Julian Mercer: You know what Freud said they are no accidents.
Harry: Trust me this was an accident.
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.
Trivia: The movie title is inspired on a Johnny Mercer song from 1954, that's why Keanu Reeves' character is named Julian Mercer.
Answer: When they were trying to see what time it was the morning after they had slept together.