Although most of the urban scenes appear to have been shot in Vancouver, B.C., when Zach's about to fall to his death, the camera (presumably Zach's POV) looks around and sees buildings in downtown San Diego, Calif.
When Dr. Sadowski helps Carla down from the cliff rock, the safety cord attached to the actress is visible.
After Carla sees Dr. Sadowski and is walking to her car on the top of the parking structure, she watches a newspaper blow around and over the rail. The newspaper then turns into the scarf her sister was wearing when she fell. The scarf "hovers" over the rail before it falls. You can clearly see a hole in the center of the scarf as if it's attached to a line.
When Jocelyn is about to bungee off the bridge, Carla is calling out words of encouragement, and at one stage calls her 'Roslyn.'