Alison Lohman wore a wig because she was bald throughout this movie, as she had just previously filmed a role as a cancer patient.
The movie Claire (Renée Zellweger) shows Astrid (Alison Lohman) is The Return of the Texas Chainsaw Massacre (1994), in which Renée Zellweger appeared.
In this movie, Ingrid is an artist, while in the book, she was a writer. Showing an artist working was deemed more watchable than showing a writer writing.
Oleander is a poisonous plant that can kill animals and people.
Melissa McCarthy appeared briefly as the paramedic moving Astrid on a stretcher following the shooting at the foster home.