Oh, and while those two guys are working the marionette strings? This is also going on:
Those guys were hired to shoot air directly up at Superman and also stare at his junk (it's a confidence thing, all actors use it).
The fact that Brandon Routh maintained a straight face while two fucking green men were puppet-mastering in the background is the only argument I need to demand an Academy Award for him. Those guys were on set all day in some giant green void waving their hands around like assholes while a nearby director was yelling "Flappier! Flappier goddammit!"