References
In Chicago italian bakery was owned by Al Scorceze - possible reference to Martin Scorsese;
One of the Chicago gangster (that one, who was sent to Russia as second hitman near the end of the movie) was named Franko De Niro - ref. Robert De Niro
Nickname of the russian ganster Little Jap references real life soviet gangster 'Yaponchik' (Little Jap in russian).