The two escaped souls are named Thaddeus Johnson and Paul Wang. "Johnson" and "Wang" are both slang terms for male genitalia.
In the US the American Bankers Association sets the standards for currency straps. The ABA straps for $50 bills are brown; there are no purple straps.
Duffin's Donuts is a well known shop in Vancouver, British Columbia. It has no branches in the US.