At the very beginning of the episode we see Sam brushing his teeth. However, when he talks to Dean there is no sign of toothpaste in or around his mouth at all.
It's never made clear why the ghouls take so long to kill Sam. They have several opportunities throughout the episode when he's essentially alone and they can dispose of him when Dean is nowhere nearby, but instead they leave him alone.
When the female bartender pours Dean the beer and sits the glass in front of him, the amount of head and the level of beer in the glass changes dramatically from one shot to the next before he even takes his first sip.
Adam: He's a mechanic, right?
Dean: A car fell on him.
Dean: I'm starving, lets get breakfast.
Sam: Where? We're like two hours from anything.
Dean: But I'm hungry now.
Sam: There is probably still a sandwich in the backseat.
Dean: It's tuna.
Adam: Okay, so basically you're saying that every movie monster, every nightmare that I've ever had, that's all real.
Dean: Godzilla's just a movie.
Dean: Adam doesn't have to be cursed.
Sam: He's a Winchester. He's already cursed.
Sam: No wonder none of the tests worked. You're not shapeshifers. You're ghouls.
Kate: You know, I find that term racist.
Music: A Little Bitty Tear (Burl Ives)
Injoke: The motel Sam and Dean was staying at was called Kelsey Manor, in honor of the late Kim Manners who directed many episodes of Supernatural. The photo on the hotel card, although it's supposedly "Sonny Buono," is actually of Manners, who looks a bit like Sonny Bono.
* The Winchesters meet Adam at the Cousin Oliver's Diner, a reference to another "jump the shark" character, Oliver from The Brady Bunch.
* As the guys eat at the diner, a "31st Annual Fonzarelli Skiing Championship" poster can be seen in the background, referring to the 1977 episode of Happy Days when Fonzie on water skis jumped a shark, leading to the establishment of the term.
* In the hotel room there's an advertisement for the Sonny Bono Lounge, referring to the jump the shark moment when he left Cher and tried a solo career.
UK: May 31, 2009 on ITV2
Denmark: June 7, 2009 on TV3
Australia: July 13, 2009 on Channel TEN
Norway: July 30, 2009 on FEM
Portugal: August 31, 2009 on AXN
Sweden: October 18, 2009 on Kanal 5
Spain: January 11, 2010 on AXN
Germany: February 1, 2010 on Sky Cinema Hits
Poland: June 18, 2010 on TVN7
New Zealand: June 23, 2010 on TV2
Czech Republic: September 17, 2010 on Prima COOL
Finland: August 16, 2011 on Sub
Slovakia: April 9, 2013 on Markiza
Cemetery Director: Tell me, Agent Nugent, have you thought about where you might like to spend eternity?
Referring to Ted Nugent. Theodore Anthony "Ted" Nugent is an American hard rock guitarist and vocalist from Detroit, Michigan.
The term Jump the Shark is a colloquial term that refers to the point when a TV show has gone past its peak and has resorted to stunt programming, such as introducing a younger sibling.
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