One of the film""s posters carried a tagline related to the character""s rebelliousness:"The man...and the motion picture that simply do not conform."With this vivid film, director Stuart Rosenberg made one of the key films of the 1960s, a decade in which protest against established powers was a key theme....Europe about o blow up and all I can get out of my foreign staff is a daily guessing game.I want some facts, Mr.Bradley!...Any kind of facts.There must be something going on in Europe beside a nervous breakdown." When Bradley offered to be sent to Europe, Powers rejected him because Bradley was an intellectual economist and not a hard-nosed reporter:I don""t want any more economists, sages, or oracles bombinating over our cables.Water pouring out of he U-shaped ""dump tanks"" was played in reverse in order to create he illusion of the sea""s parting.To restore the original Hill Valley to its better state, "Doc" and Marty had to travel back to the year 1955 to the time of Marty""s and "Doc""s" previous visit (in the first film) - November 12, 1955 - the date that older Biff gave his younger counterpart the almanac, and prevent the incident from happening.