Why does Tom Servos head look like a cylinder in several season two episodes?
There are both “on-screen” and “off-screen” reasons: On screen, Servo was given a “haircut” in episode 205- Rocket Attack USA. Off screen, using a different kind of candy dispenser as Tom’s head was an experiment to see if they could find a way to have Servo block less of the movie screen. It was abandoned after a few episodes and the old Servo head returned. (Note: that model of candy dispenser is also available at the many of the same places you can get the standard “Servo head” model.