Kathleen Munroe, who plays Elizabeth, also played Katie's mom in the season 3 episode The Kids Are Alright (2007).
When Dean asks Martin if he actually saw Benny kill the cafe patron, Martin replies, "You ever hear of Occam's Razor? 'Keep it simple, stupid'." He is referring to the problem solving principle of 11th century philosopher monk William of Ockham that states where there are competing theories, the simplest solution should be chosen.
The name of the diner Benny works at is named Guidry's. Ron Guidry was pitcher for the New York Yankees nicknamed "Louisiana Lightning".