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Suki Waterhouse was in a previous post apocalyptic film, The Bad Batch.
Rumer Willis' father is Bruce Willis, whom Milla Jovovich starred alongside with in The Fifth Element.
Ash has one green and one blue eye. The term for a person with different colored eyes is 'complete heterochromia'.
If you look closely, you might recognize some of the wardrobe from the 1995 motion picture Waterworld (1995) starring Kevin Costner