In the scene where Rodney is repairing Big Weld while they are being chased, Big Weld sings a small snippet of "Daisy" in a low & slow voice. This is the same song & voice that HAL sings in 2001: A Space Odessey as he is being shut down by Dave.
Watch when Rodney first arrives in Rivet Town
When he bumps into the break-dancing robot
After he leaves, wait until the last second of the shot of the break-dancing robot
a little left to the centre of the screen, you can see a robot that looks like... more
In the scene where the main character (whose name escapes me at the moment) is a teen and he's inventing in his room. Behind him is a poster depicting a red robot and a blue robot, they are inmistakably the two robots that you battle in the classic game... more