Your post prompted me to look up Predator 2 trivia on imdb.com. Very interesting stuff (if true.)
Some highlights:
1. Gary Busey's role was written for Schwarzenegger but Arnold thought that part would be stupid for him and declined.
2. Patrick Swayze was offered the role of Harrigan prior to Glover but couldn't participate due to injuries incurred while filming Road House.
3. Predator 2 was the first movie to be given the brand new NC-17 rating prior to 20 cuts to bring the violence level down.
4. The film was set in 1997 and all the actors sweated profusely as a cautionary nod to the impending global warming crisis, but actual 1997 turned out to be a degree colder on average than it was in 1990.
5. Fox offered the directing job to McTiernan again but they couldn't afford him after Die Hard increased his asking price.
6. Fox briefly considered having Arnold return to help Harrigan but by that time he was already committed to T2.
Predator 2 (1990) - Trivia - IMDb