Visible crew/equipment: When Dan reluctantly tells his secretary that he will accept Alex's phone call, if you look in the top left hand corner of the screen, you can see a boom microphone make a quick appearance.
Plot hole: In the kitchen, when Michael Douglas is preparing the hot water for the tea just before the final bathroom fight, there is a shot of him looking up at the ceiling and noticing the leaking water (obviously from the overflowing bathtub). But, he turns back toward the stove and continues to prepare the tea, instead of having an immediate reaction that something is wrong. It is not until the teapot whistles, and his wife screams, that he realizes something is wrong. He should have run up stairs as soon as he noticed the water leaking from the ceiling.
Continuity mistake: In the scene where Beth is desperately trying to find Ellen, she approaches a stopped Chevrolet Caprice wagon and rear ends it. When the camera switches to an interior shot of Beth's vehicle during the collision, the vehicle in front has changed to a Ford LTD wagon.
Continuity mistake: After Glen Close kicks Michael Douglas out of her apartment he's standing next to her bicycle holding his stuff. It can be assumed that he put the stuff on the bicycle seat because in the next shot his hands and the handlebars are empty. But later as we see him getting ready to leave again his stuff is the on handlebars. (00:34:35 - 00:37:10)
Continuity mistake: When the phone rings as Beth paints, Beth puts her roller in the tray and goes to answer the phone. When she returns the roller is in a different position than it was before.