Other mistake: When the bad guys are taking the cash from the vault, they finish with just 3 duffel bags. Yet there are blocks of cash along all the walls, roughly 25 times as big as what they're taking. With the duffel bags supposedly containing $100 million, there would be tens of billions of dollars for the taking. Their escape route is up the elevator to the roof, and into a helicopter. What bad guys wouldn't take all they could carry?
Other mistake: Like many movies, the security guard at the front desk of Redvale appears to have intimate knowledge of the CEO's personal calendar, and can verify their appointments - such as the bad guys when they show up. Not impossible, but very very unlikely.
