None of the butterflies that appear early in the film have antennae. After a classmate draws antennae on Cody's picture of a butterfly, however, all of the butterflies and moths in the film have antennae, a small detail that shows how Cody's dreams are not only childlike, but easily influenced by others.
This movie was slated for wide release on September 25, 2016 until Relativity Media (the film's domestic distributor) filed for bankruptcy, leaving the fate of the film unknown. The film was later acquired by Netflix.
Director Mike Flanagan had repeatedly objected to the film being marketed as a "horror movie," and instead referred to it as a "fable" or a "supernatural drama."
The girl that sits next to Cody in class, who draws the antennae on the butterfly, also starred in another horror film, the Conjuring film, as the youngest child in the Perron family.