The cawing of birds in the outside shots is not an enhanced effect. It was captured in the real time sound.
The painting of Gabriel really was painted by Keri Barker.
The voiceover for Gabriel's adopted mother, Mary, is provided by Jennifer Foreman.
The jacket hanging on a chair in the kitchen that Samantha gets both a cell phone and knife from belonged to her late father, Daniel Anthony.
Wournos, WA the city Samantha lives in, according to the letter she has written to Gabriel, is a fictitious place. It is named for serial killer, Aileen Wournos.