In the restaurant scene with Jill and Heinz, her fingernails go from long to very short when she is looking at her pocket watch.
Life insurance on Michelle St. Clair is initially mentioned to be $2 million, but later is said to be $1 million.
When he's showing slides to the Angels in the office, a close-up of Bosley is terribly out of focus. The shot may have been blown-up in post-production rather than zoomed in on the set.
As the strangler approaches Michelle, the reflection of a crew member's arm is visible on the sliding glass door.