Knock Knock the making off - interview with Kenau Reeves and Nicolas Lopez (co-screen writer/ producer) who states: "you have to forgive the guy" "If somebody knocks on your door and has free PIZZA and you can eat it your gonna take the Pizza". In the movie Kenau Reeves's character refers to underage sex as "Free F$cking Pizza". Additionally, the cut scenes show the girls drawing on large wall prints "We love Pedophiles" and referring to the son's age as "NAMBLA friendly" and worse.. Relates to Pizzagate because its a Hollywood depiction of the use of the word "Pizza" in the context of sex with a minor.

https://www.youtube.com/watch?v=6PhHzj1bxl8