Visible crew/equipment: When Kate and Carly follow Mark to Connecticut and are looking over the gate, they hear someone coming and jump into the bushes. Some workmen drive out, and then Carly and Kate get up out of the bushes. When they do, you can see the black mat/cushion that they were lying on.
Continuity mistake: In the scene when Kate is in her wedding dress crying and Carly comes over to her house to check on her, the girls are upstairs and Mark comes home early. Kate shoves Carly out the bedroom window on the second floor, who falls through a lower roof and onto the ground. In the next shot, Carly is lying on the ground surrounded by a bunch of white 2x4 boards that have suddenly appeared.