The film was shot in 36 days.
In an interview with Chris Stuckmann, Colin Trevorrow stated the screenplay is 20 years old.
This will be the second collaboration between Jacob Tremblay and Naomi Watts. Their first collaboration is Shut In (2016).
Naomi Watts and Jaeden Lieberher also starred together in St Vincent.
Big screen debut of Maddie Ziegler.
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