Obscene language is sort of a given.
The games desktop icon depicts the main character flipping the viewer off.
Additionally, if the player only kills one of the two janitors at the end of ‘Resolution,’ the remaining janitor will flip off the player character.
One of the antagonists who the player must find is held in an interrogation room at a police station, it can be presumed that he was being tortured for information.
The player has to stumble through a hospital while avoiding nurses and police to escape. The screen gets blurry and a loud noise plays if the player walks without stopping for a while
The janitors seen in the final level are self-inserts of the games two developers. In the normal ending, a few of their remarks to the player are sly references to this fact.
Kinda, on the promotional art for the game Biker can be seen in the background reading a magazine with a topless woman on it. The actual game has no nudity.