Two pieces of trivia I've learnt today:
1. Because Die Hard is based on a book sequel and the original had been made into the film The Detective, the filmmakers were contractually obliged to first offer the role of John McClane to the star of that film, Frank Sinatra, who was 76 at the time.
2. James Woods fired his agent after hearing that he'd been offered a role in Reservoir Dogs but wasn't told about it.