In the beginning, Sam and Dean are sitting near water relaxing and drinking beer. When the camera zooms out, there's a sign that says "No Hunting."
The scene where Sam and Dean are sitting and drinking beer, this is the setting where
Jared Padalecki's ALS bucket Challenge was filmed.
Sam and Dean enter King County Sheriff's department, while an actual place in Washington this is also the same name as the Sheriff's department that Rick Grimes from The Walking Dead (2010) works out of.
Tasha refers to Sam as Paul Bunyan. Paul Bunyan is a giant lumberjack in American folklore.