Continuity mistake: There is no cork on the corkscrew after Freck uncorks the wine.
Continuity mistake: When Ernie lifts the bike, he picks it up by the top wheel. When he is shown carrying the bike a second later, he is holding it by the lower bar.
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.
Continuity mistake: While Bob/Fred is giving a speech at the NewPath building, he takes his arms off the Podium and turns his side to the crowd. In the next shot, he's facing forward and his hands are on the podium again.
Continuity mistake: When Barris first speaks to the police, he is snipping at his hair with a pair of scissors. When he stops, he holds his forearms up and then clasps his hands together. In the next shot, he is seen from behind, and his forearms are apart, but then shown from the front his hands are clasped again. (00:27:35)
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