When they're making love in front of the fireplace in the log cabin, in long-shot McCoy rolls over on top of Margaret. Jump-cut to close-up, and McCoy again rolls over on top of Margaret, hitting her in the mouth with his medic-alert.
Shin rolls up the same sleeve twice to use a syringe.
About 9 minutes, Catherine is in a bank with he safe deposit box. As she takes a syringe and small vial of liquid out, it appears she sticks the needle into the bottle, and withdraws fluid. However, you can clearly see the needle never enters the vial; it is stuck next to the metal ring at the top of the vial.
Debra Winger shadows Theresa Russell on the top deck of the Seattle to Bainbridge Island ferry. The same mountains in the Olympic range are behind both actresses, even though one lady is on the starboard and the other is on the port side.
Investigator in the last fifteen minutes of the movie refers to Jessica Bates as Jessica Barnes.
Alex (Debra Winger) says there was nothing she could do to prevent the anticipated murder of William (Nicol Williamson), yet all she had to do was identify herself and show him the many photographs she had of his wife's (Theresa Russell) previous marriages and pointed out that they were all wealthy men who died shortly after marrying her. He would have recognized her in the photographs, of course, and would have started asking questions.