* For a world with no emotions, way too many characters (Brandt, Dupont, Preston's kids) so obviously display them. This is {{foreshadowing}} that Preston is the only named character taking a normal dose of Prozium at the beginning of the movie.
* Preston is so enraged at the end of the film that his emotions flatline, putting him into a TranquilFury that allows him to perform the GunKata with perfect effectiveness, outpacing all of his opponents, who are all either emotional or artificially dulled emotions from Prozium.
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