At the end of part 1, Kanja-Ro says that Green Lantern's energy beam bounced off the deflector shield of an attacking ship and hit a volcanic fault line. In the recap in part 2, Kanja-Ro says it was a stray shot by Green Lantern Stewart that caused the destruction of Arcturus 4.
Kilowog's ring changes hands during the bar fight when he catches a fellow Green Lantern.
With no air on the moon for Hawkgirl to flap her wings, she shouldn't be able to stop herself from spinning.
Hawkgirl shows up on the moon in an Ajuris 5 spacesuit. Ajuris 5 just happened to have a suit not only with wing holders, but ones to handle the design of her wings.
Why is it only J'onn J'onzz and Superman noticed the moon hadn't flown off?