Gibson says that the $10 bill found in the safe was from the Banner Bank heist. However banks do not keep a record of the serial numbers of cash, it just isn't practical, it is a common myth that they do. The only serial numbers that are recorded are from bills that are in the stack of cash with a dye pack in it, which this bill clearly was not a part of.
When LaCroix is leading Hewitt out of the park after arresting him it is obvious that he isn't actually handcuffed, he is just holding the cuffs in his hands.