Michael Biehn shot his scenes for free in one day as a favor to his good friend Electra Stone, one of the producers.
While eating fugu, Duke says "I cannot see her tonight. I have to give her up. So I will eat fugu." This is, in fact a famous senryu from Japanese poet Yosa Buson, written in the 18th century.
The van that is used for the diamond burglary says Falkore Plumbing on the side. Falkor is the name of the Luck Dragon that Atreyu rides in The Neverending Story. Atreyu was played by Noah Hathaway, who plays Fish in this film.
One of the plainclothes policemen in the van outside the place where the "reunion" is being held, tape recording the criminal conversations within, is named "Det. Harry Caul Jr." "Harry Caul" was the master audio surveillance character played by Gene Hackman in "The Conversation" (1974).