Back to the Future ref.
When he's having a piss, he pushes his sunlasses up and looks at his watch, just like te BTTF poster.
Then when they are all doing it, it's the poster for part III
No idea if it's areqady been picked up! Probably.
I was also wondering if they were referencing BTTF whenever Ray was joking about having a "machine with dials and dates" as opposed to it being operated by "karaoke and urine."
Apart from the BTTF references, I also enjoyed their homage to Doctor Who, with Toby's Scarf, and when Ray admits that his dream profession would be a "Timelord"
Although my favorite has got to be the Bill and Ted references when they first discover the mural of them on the wall.
TOBY: Maybe we start a band.
RAY: Can anybody play anything.
TOBY: Maybe we learn?
RAY: Or maybe, it's not a band
Any society that would give up liberty to gain security will deserve neither and lose both.