 FACT: If youre watching the movie with subtitles you will notice  that, when one of the guys is impersonating Robert DeNiro in Raging  bull, the subtitle says "impersonating Robert DeNiro". Later on  however when the same guy is impersonating Scarface, the subtitle  also say “impersonating Robert DeNiro”. However a true fan will know  that it is Al Pacino who is in Scarface.