There's a difference between filming a script and making a movie.
Writer/Director Stephen Chbosky on The Perks of Being a Wallflower - Filmmaker Magazine
The Perks of Watching The Perks of Being a Wallflower, by Ellie Trulson, Ellie's Words
The Perks of Being a Wallflower (2012) by Stephen Chbosky — Cinematary
FILM: The Perks Of Being A Critic - The Ryder Magazine & Film Series
Imaginary Friend: Perks of Being a Wallflower's Stephen Chbosky goes dark
Two Lives in Pittsburgh explores parenting a gender-fluid child in a difficult world
Stephen Chbosky on writing novels with a cinematic eye
The Toughest Scene I Wrote: Perks of Being a Wallflower Writer-Director Stephen Chbosky
The perks of a bad break up: inspired author writes book and movie – the Southerner Online