Harvey Keitel received his only Oscar nomination so far for portraying Mickey Cohen in Bugsy.
After his first scene he barely is on screen and when he is on screen he really is just in the background making the occasional comment that is in no way remarkable. Cohen as a character in this film just simply has little to no impact on the film. Aside from his first scene there is never a scene that even focuses on him for more than a few minor moments. This really is a character as written that it would have been impossible for any actor to make anything special out of it.
Keitel though does really portray the part of Mickey Cohen as well as anyone could. He talks tough he has the right demeanor for the typical gangster. He really is just as he should be but the problem of course is the fact that Cohen is such an undemanding role that there post certianly is nothing about Keitel's performance that comes across as memorable or even particularly interesting.