The robot designs for Maria seem heavily influenced by the 80's robot art of Hajime Sorayama.
The sound effects used for Pioneer 1's footsteps are the same as the Power Loader in Aliens (1986). Pioneer 1 also has the same growl as Ed-209 in RoboCop (1987).
Shotgun sound effects from RoboCop (1987) are also used in this movie.
Shotgun sound effects from RoboCop (1987) are also used in this movie.