Leguizamo said, “He would give the same performance that he just gave in front of the camera, he would give for you behind the camera. That's how generous an actor he is.”
This did result in Leguizamo “hating” DiCaprio a bit while they shot the film, but this hatred was more a sign of professional admiration than animosity.
He said, “It came so easy to that little blond, happy golden boy. He'd smoke a cigarette, do some laps, do a Michael Jackson impersonation, go on the set, and there it was.”