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.
The game takes place in 2016.
When you go down under in close to middle/beginning on a wall, it says ColeM. Or C. McGrath Electronics, a reference to inFamous 2 (2011).
The emblem on the back of Delsin's jacket changes as his heroic/infamy level changes.
There are Sly Cooper Easter Eggs throughout the game.