In the second season episode "The Getaway", a French waiter jokes that Michael Vaughn speaks French better than he does. In reality, actor Michael Vartan, who plays Vaughn, was born in France.
The movie playing in the theater where Jack goes to meet his contact is the 1949 film D.O.A. starring Edmond O'Brien.
When Kane's men are looking up info on Vaughn it shows that his middle initial is C, his SSN is 987-65-4320, and his Badge ID number is 897354722.