Can see what you mean about it being on the nose but I just thought that line was first big laugh of the season and an example of the show's dark humour finally surfacing (sorta similar to Malvo's "you think I'd want a pink walkie-talkie?" line from last season). Tonally, season 2 has been a little heavy on the doom…

It's on TV screens now! Coming this summer…

HUMAN MEAT

Okay, I've done some reading further down and it seems I know absolutely NOTHING about drugs.

I'm pretty confident - maybe just through hope - that the flashing lights were the result of hallucinations from whatever he snorted before he went into the diner.