
Continuity mistake: When Barris is served in the diner, french fries are scattered over his plate. When seen again, the french fries are replaced with vegetable sides.

Continuity mistake: Donna's earrings disappear and reappear while she is drinking coffee in the restaurant.
Chosen answer: You are working on the assumption that it would be a standard 9-to-5 job and that the same people would be walking in at the same time. Bob Arctor is seen to go in irregularly and "Hank" would also keep irregular hours, much like officers in real-life. James was also seen to enter and exit the building and he was a witness; other witnesses, lawyers, public officials, the medical staff and janitors would also irregularly enter and exit the building. There are simply too many people entering and exiting the building randomly for anyone to definitively figure out who is who, particularly as their real and "suit" identities would be kept as separate as possible, "Hank" only figured out it was Bob because she was Donna. The identities of real-life police officers (particularly officers working undercover, especially on drug-deals) are routinely kept secret and the design of the building that Bob and "Hank" work in would be designed to protect their identities and the scramble-suits would be another layer of protection on top.
Sanguis