The “Hickey from Kenickie” was in fact 100% real
Stockard Channing (Rizzo), said in an interview that it was Jeff Conaway (Kenickie) who insisted on applying the hickeys himself.
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Danny Zuko’s nod to James Dean
Danny’s blue wind-breaker, which we see in the opening beach scene, is said to be a nod to James Dean. James wore a red wind-breaker in Rebel Without A Cause(1955).