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 The Matrix (1999), so he went alone.
This film is listed among The 100 Most Enjoyably Bad Movies Ever Made in Golden Raspberry Award founder John Wilson's book THE OFFICIAL RAZZIE® MOVIE GUIDE.
In the beginning of the film Nelson is in a towel talking on the phone. In the matter of one line Nelson becomes fully dress. There is not enough time for him to button the shirt and put on his belt.
When Nelson is apologizing to Sara from the cab after turning down the lucrative job offer, you can see several people in a large second story window watching the production in the background.