I love the film's energy. I love the movie-star charisma of John Travolta in the lead. I love the "am I doing this right?" hesitancy of much of Olivia Newton-John's performance. I love the fact that the film is so unapologetically filthy.
The screenplay is a prepubescent shambles, the direction is by acne out of disposable douches, the dubbing and looping of the songs is painfully obvious, the characterizations are generally repulsive and the whole thing is utterly without style.
Travolta is a riot. Alternately swaggering to prove his "coolness" and re-affirming his ability on the dance floor, the actor gives the kind of performance that's perfect for the role.
One of the most commercially successful transfers of a Broadway musical to the big screen, Grease is not a great movie but it's a lot of fun to watch and listen due to superlative cast.
Couldn't the makers of "Grease" have unearthed one person who was alive in that time, perhaps even one who attended an American high school then, and checked their information?