Apparently, to prepare himself for the cross-dressing scene, Jason Isaacs wandered the drag clubs, picking up on behavior of people there. He wanted to bring Keanu Reeves along, but it would be hard to go undercover with the star of the newly-released Matrix (1999), so he went alone.
One of the dogs rescued by Charlize Theron in this film (the one she re-homed and later took back) also played Verdell in Mejor... Imposible (1997).
The footage of the radio-controlled submarine under the water was taken from La caza al Octubre Rojo (1990). The first scene of the sub shows a Soviet Alpha class attack submarine captained by a former student of the Red October's skipper (Sir Sean Connery) and now hunting Red October with orders to destroy it, while the second scene is of the U.S.S. Dallas.