These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Complete Monster: Mickey Cohen is an utterly psychotic mobster whose brutality terrifies even other hardened mobsters. Cohen opens by having a friendly emissary from the Chicago mob executed by being torn apart between two trucks, before throwing a group who are late in their protection money in their building, locking them inside and burning them with the building. A building he'd had women brought to in order to be hooked on drugs and turned out as prostitutes. He furiously executes an underling with a power drill due to the man failing him and when his girlfriend opts to leave him, Cohen sends one of his men to throw acid in her face.
Harsher in Hindsight: The scene in the trailer where gangsters fire upon people in a movie theater while emerging from the screen became this after the 2012 Aurora theater shooting. This even prompted a reshoot for the film and pushing its release date back several months.
Narm: A few of Cohen's lines, most notably "Here comes Santa Claus!"
Never Live It Down: The above incident likely doomed the movie, causing a very poor box office opening.
Overshadowed By Controversy: Even with the reshot scenes, the film as whole was deemed to be so violent that it was still hard to forget the parallel with Aurora.