The only scene not written in the script was the scene with Nivola and Walken in the sales condo talking about the cat and the question mark.
Sharon Stone spent three days filming, and it wasn't difficult to get her after she found out Christopher Walken was attached.
Nigel Cole wanted to use the Rolling Stones' You Can't Always Get What You Want, but it proved far too expensive ($1 million).
Marcus Foster, a young 19-year-old English singer/songwriter, did one of the songs in the film, and he doesn't even have a record contract.