After their first meeting in the bar (between Bob and Calvin), while walking out to the motorbike (and after the ride), Bob goes from sneakers to open sandals and back.
When Bob shows his motorcycle, there aren't any helmets in sight. Not on the bike or on the ground next to it. Yet, moments later, both Bob and Calvin are wearing helmets when they ride the bike.
When Calvin first logs onto the website and finds out its an auction finishing in 14 hours time, it is approximately 11pm so that would mean the auction would finish at 1pm the next day, but it doesn't seem to finish for at least 24 hours if not 36 hours.
When Calvin spills his coffee next to the photocopier, he used the garbage can to cover his spill. In the next scene, the garbage can is back to its original position.
When Bob and Calvin leave the bar, the bouncer requests the patron walking up to the door for their ID (using hand gestures). In the next shot further away from the door, we see the same patron and hand gestures.
While the Badger reloads his gun during the bridge scene, a shell casing ejects. This could not happen because the gun was already emptied and no shell casing should be present in the gun.
When they are flying the plane, Bob intentionally shuts the plane off to simulate the plane going down. When he turns it back on they show him flipping the master switch back on. In GA aircraft this switch only controls the electronic systems (which are still operative) of the plane (navigation, radios) and has nothing to do with the engine of the plane, which is either shutoff my the mixture, fuel shutoff or magneto switch.
Bob rigs up the sprinkler head to go off in Calvin's office and, a few minutes later, all the sprinklers on the office floor activate. In reality, only the one sprinkler head will activate. It will not cause all of them to go off.
When Bob throws the rod thru the spokes of the motorcycle to knock the hit man off, Calvin then takes the motorcycle, yet the wheel spokes would have been destroyed, making the bike inoperable.
While Calvin is distracting the airport security guard Bob is behind him pulling a large rope that he's supposedly using to tow a single engine plane out of the hanger that would weigh hundreds of pounds yet there's never any tension on the rope as Bob pulls it.
As Bob and Calvin are driving away from the CIA interrogation room, the gear shift lever is in the "Park" position.
In the office scene, CIA Agents are knowingly fire there weapons at Kevin Hearts character. Any government agent and or police officer, would know not to discharge there weapons why there are
civilians around. This could lead to a accidental death, or someone to get hurt. They would likely try to to get Bob without using weapons, or use a non lethal means. Good action scene, but doesn't make sense.
The math club signs and posters from 1996 are still hanging in the school hallway 20 years later untouched. No wear and tear, no fading.