It was very unusual, because normally the producer requests the test to determine whether they want to hire someone or not. Olivia was concerned about playing a seventeen year old.
We sent away to a Chicago distributor for about twenty vintage 50's popcorn trailers, but they didn't arrive until the night we were shooting at Burbank's Pickwick Drive-in (now a shopping mall).
Olivia Newton-John was our first choice to play Sandy, but she was nervous about acting, whether she would feel comfortable with us and could pull it off at all.
I told her it was a bigger than life musical, that all the actors were going to be about the same age, late twenties into thirties. It would be a style; a kind of surreal high school.