When the two fake cops walk into the secured building, they each place a duffel bag on a table. After passing an ID check, they go to walk through a metal detector. One of the fake cops picks his duffel bag back up before going through the detector. As the camera angle changes, both bags are back on the table, and the two fake cops each pick one up.
When the man tapes Natalie's mouth shut she struggles so the duct tape is all wrinkled and her bottom lip is sticking out. The next shot that Natalie is in, the duct tape is almost completely flat with no wrinkles.