In Game Easter Eggs

There are in the trunk of Jack the stickman's cock. See Trivia section of Jack's Gay Shitters.

In the achievement page, if you scroll further down, you will see a Shit-in-a-bottle and some cockballs, which may be a refrence to the Cockass Game.
 * 1) Further down is a carcass of a dick and an Atomic Dick from the Heavy Cock game.
 * 2) Even further down is a key, an SHIT agent ID and a dented medal saying only "C.O.C.K.", could be based off the Dickhead Series.
 * 3) Going downward more and you will see remains of the Penis, it is Dr. Shitboss's Zombot from Plants Vs. Shitheads.