In Act 1 Chapter 1, about half way through the level, if the player runs up to four pipes in the area and waits for a few seconds, a chicken will pop out of the last pipe. If the player shoots the chicken enough, it will turn into a Giant Gold Lambent Chicken that breathes fire. If killed, it will explode into flowers and drop pieces of candy.
Contributed by ThisGuyInTheSuit
In an early version of the game, the Locust execution is different. Instead of ripping the player's arm off and hitting them in a single direction, the Locust would hit them in an up and down motion.
Contributed by Shiny Blazeikin
In the "Checkout" map of the multiplayer mode, if the players pull all of the fire alarms, collect a fire extinguisher and extinguish a flaming fire alarm, a shopping trolley to roll out by a window with a red hat in it. Shooting the red hat will cause it to then explode, causing another hat to appear in a window which can also then be shot. An explosive of some sort will then detonate on the crashed car, causing it to set on fire. Extinguishing the fire will make the fire exit doors close and the scythe that the mannequin outside is carrying will then teleport to one of the bathrooms. Shooting it will cause it to bleed and retract into the ceiling. Proceeding to the electricals department and extinguishing a flaming microwave will then cause an explosion to happen outside of the broken doors in the same room. Once the smoke clears, a dancing wretch with the red hat and scythe can be seen. Killing him will make him disappear, leaving only the hat and scythe.
Contributed by DrakeVagabond
In Act IV, Chapter 1, there is a secret room with an arcade cabinet call Sawed Off Chicken. Kicking the machine in Insane Mode will allow the player to play the game for a short time.
Contributed by DrakeVagabond