I don't know how Ed does it, but he snuck on the set of Dancing With The Stars to return the earlier favor, and teaches Donny how to dance. Although his dance moves are sub-par, he has an uncanny ability for coming up with the most random suggestions.
Donny Osmond begins Dancing With The Stars: Season 9 and Ed is keen on getting dancing lessons from a "star." Without any regard to privacy, Ed and his "wife" barge in on Donny's hotel room for a couple quick pointers.