Cast the Expert: Benny the Jet, a legendary kickboxer as well as Cusak's personal trainer, has a role as an assassin (his character is also Basque, which ancestry Benny has as well).
Fake American: Brit Minnie Driver as Cusack's old love interest, from his hometown in Michigan.
Incestuous Casting: Played with. Joan Cusack's character seems to be harboring a crush on Martin. (Martin doesn't reciprocate, he's too hung up on Debbie.) The Cusacks have something of a history of this trope.