Several references to other Sucker Punch (the developer of the game) games are referenced in this game. Many times you will see the name MacGrath or McG on buildings and signs. This is a reference to prior inFAMOUS (2009-) games, which had a protagonist named Cole MacGrath, who wielded electricity. Also, Delsin's ringtone is the Sly Cooper (2002-) theme song, with cartoon raccoons on a playground's walls and some neon signs in the shape of a raccoon's head.
Technically there are 3 endings: Hero, Infamous, and semi-evil. Semi-evil can be seen if the player plays through as evil, but saves Hank. The ending is similar to that of the Infamous one, but it ends after Betty closes the door on Delsin, removing the bit where he does an Orbital Drop on the Longhouse.