A brief list of movies that were not nominated for best film in 1956:
The Searchers, Early Spring, The Killing, A Man Escaped, Invasion of the Body Snatchers, The Man Who Knew Too Much, Aparajito, Street of Shame, The Wrong Man, Godzilla: King of the Monsters.
A brief list of movies that were nominated in 1956, but didn't win:
Friendly Persuasion, Giant, The King and I, The Ten Commandments.
Academy, what the hell were you thinking?