4. Romeo and Juliet didn't like each other in real life.
Both Danes and DiCaprio spent very little time getting to know each other before they began shooting the movie. It certainly didn't help that their first scene together was the one where Juliet was topless. Danes reportedly thought DiCaprio was “very immature” because of his continuous on-set pranks, while DiCaprio found Danes to be standoffish and uptight. 15 years later, DiCaprio and Danes got the opportunity to work together in the Clint Eastwood-directed film J. Edgar, but Danes turned the offer down.