About 34 minutes into the film, there is a scene in a restaurant. In one shot, there is a waitress at the table, and another one setting down plates at a table in the background. The camera cuts away for less than two seconds upon th arrival of a character, then cuts back, but with both waitress prematurely gone.
In the scene where Lucy catches Sam working at his laptop in the middle of the night, his shirt changes from a t-shirt in one shot, to a sweater in the next.
Position of the mike on Melinda's headset.