The caller ID for Crowley on Dean's cell phone is 666.
At the beginning of the episode, Gavin is seen unscrewing a bottle top. The bottle appears to have threads on the outside of the top. After taking a drink, he then rescrews the top onto the bottle. This occurs in the year 1723. Screw tops for bottles weren't invented until the mid 1800s. Even then, the bottle threads were on the inside of bottles, not the outside.