As Luke approached the ancient Tree Library housing the sacred Jedi texts, he had a ghostly vision of Master Yoda (voice of Frank Oz).Out by the guard railing near the falls, where they were surrounded by happy, romantic couples, Lois removed Clark""s eyeglasses to clean them from the mist - she did a double-take and became suspicious when he looked similar to Superman without his disguise.When dawn arrived, police arrived on the shore and called out to her - she awakened and sat up.Suddenly, Jason""s decomposed corpse lept out of the water at her, grabbed her by the neck, and pulled her underwater from the canoe -- the film""s most shocking boo-moment.Marty was zapped back 30 years earlier to November 5, 1955 (before Marty was born!) - the day that "Doc" invented time travel when he hit his head (falling off his toilet while hanging a clock) and had a vision of a "flux capacitor.