Before Jaws (1975), studios released films year-round with no "season." Spielberg's shark film pioneered the concept of the summer blockbuster and changed Hollywood's release strategy forever.
The Wizard of Oz (1939) used sepia tones for Kansas and colour Technifilm for Oz deliberately — one of the earliest uses of colour as a narrative storytelling device.
Alfred Hitchcock's Psycho (1960) was the first major Hollywood film to show a toilet flushing on screen. Censors had previously forbidden it as indecent.
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