Continuity mistake: During Adam's summation, the close up shots of Amanda show different reactions to his speech. The long shots show her just sitting there, not reacting. This goes back and forth several times.
Continuity mistake: In the beginning, when Adam and Amanda are driving to work, the rear view mirror in the convertible disappears in the close up shots.
Continuity mistake: At the very end, when they're at their farmhouse, sitting on the bed with Adam faking his tears, the close up shots of Amanda are markably different than when they show the insert shots of the two of them together.
Continuity mistake: When Adam confronts Amanda and Kip in Kip's apartment with the licorice gun, the handkerchief in Adam's suit pocket keeps changing lengths.