Release Therapy bonus level:
Complete the game to unlock a bonus level called “Release Therapy”. In this level, you play as Leo rather than Daniel and fight many difficult enemies. After defeating the final Boss, you will receive the bad ending. Like the “personality clash” ending, it is unclear what happens to Danny or Leo.
Relive Scene option:
Complete the game to unlock the Relive Scene option which allows any level to be replayed, and also unlocks the “Release Therapy” bonus level.
Familiar face:
Go to the door where the guard tells you he will not let enter because you are not a familiar face. Turn around. Go off the stage. Climb up the steps on your left. Then, go up the stairs on that side. Move up the stairs until you reach the top. On the right side down the hallway is a case on the wall. Inside the case is an ax. Use the ax on a person or body. Executions immediately detach a head, where as hacking at a corpse requires a few swings. Pick up the head. Run back to the door and equip the head as a weapon. Go to the door and press [Action]. The guard will let you enter.
Alternate dialogue:
In Episode 15, if you do not kill anyone besides Leo and sneak your way to where mental Pickman and Michael are, instead of saying “Here’s some more of your victims”, Leo Kasper will say “What? Have you turned over a new leaf?”