When Fiona finds the copy of Vaughn's passport in the file, the birthdate used is September 14th, 1953, the same birthday of Robert Wisdom - the actor who plays Vaughn.
The Porsche that Fiona blows up has different rims than the one that Jesse normally drives.
Gregg Henry who played Val Resnick in Payback (1999) tried to kill the character Porter played by Mel Gibson. In Acceptable Loss (2011), his character Ian Covey is friends with the character Porter played by Coby Bell