The calculator's display reads "1337" most of the time. This is an expression which became popular in multiplayer computer action-games: It means "LEET" (letters replaced by similar-looking numbers), which is derived from the word "elite".
Alexander Tuschinski wrote the Mutant Calculator Song while finishing post-production of his previous film Menschenliebe (2010).
Every crew-member involved in the production also has a cameo in front of the camera.