Continuity: One scene has Glenn Close in bed shot from profile, and the sheet in down exposing her breasts. The film cuts to a frontal shot and the sheet is up around her neck. When it cuts back to profile, the sheet is down again.

Continuity: Alex takes the cigarettes out of her bag twice when she and Dan have lunch in the restaurant.

Continuity: In the beginning, Michael Douglas tells Glenn Close that he has a 6 year old daughter. Later in the movie when Douglas is talking to his wife on the phone about the daughter missing school, she says "She's 5 years old, what is she gonna miss, Trigonometry?"

Audio problem: The dialogue that Michael Douglas hears Glenn Close saying when he walks into his apartment to find Glenn Close talking to his wife is the exact same thing that she says just before she leaves when Ann Archer gives her their phone number.

Visible crew/equipment: The boom mic is visible in the top corner of the Volvo's windshield, when Michael Douglas waves goodbye to his daughter on the street at the beginning.

Other: After Dan visits his wife in the hospital, he goes to Alex's apartment. In the scene where he's chasing Alex and crashes into the glass door, shattering it, look closely at his face and you'll see it's not Michael Douglas but a stunt double. A few seconds later when they are struggling in the kitchen, look again and you'll see the same stunt double.

Continuity: In the last portion of the film, the background shows autumn-leafed trees when Anne Archer drives downtown.  When the scene switches to the house, all the trees are lush and green in the yard.

Continuity: Iron Couple Award: Not necessarily a mistake, but Michael Douglas and Glenn Close start their frenzied lovemaking in the kitchen as a clock reads 4:45, and they're still going at it when the clock later reads 6:15.