The line "I think I broke the door" in the First Target scene was improvised after Robert Hoff actually did break the door with Carter Creamer's body.
A large percentage of the scripted dialogue was replaced with improv.
The sandwich Sideburns ate was made specially by Kevin Arthurs himself: it contained whipped cream, cookie dough, a snickerdoodle, and cheese.
The role of The Informant was initially written with Tyler Pokorny in mind.