Marie Osmond was the front-runner
As suitable as the wholesome singer was for the role, Osmond did not accept the offer. Because Marie Osmond was raised Mormon, she objected to play Sandy’s “bad girl” transformation.
Danny Zuko as a busboy?
Yes, believe it or not, this was one of the many visions Allan Carr had for the character. Not only did Carr imagine that the T-bird would work at a gas station, he also had Danny singing a song called, “Gas Pump Jockey.” I think this “no” decision, was one of the better ones.