When Sam is killing Samhain, his nose starts bleeding and the blood reaches his chin. However, in the next shot his face is clean and he starts bleeding all over again.
When Sam is researching in the hotel room in the beginning, he picks up the Goldthread to inspect it when he is flipping through books, and keeps it in his hand when Dean comes in. When he starts to tell Dean about the hex bag, one shot shows the Goldthread in his hand, and the very next, he picks it up from the hexbag, without having put it back.
When Sam and Dean ask the victim's wife how many razor blades were found she says "two on the floor, one in his stomach and was stuck in his throat." When you watch the scene where the victim spits out the razor blades, there are two on the floor but a third one is heard falling on the floor. So there should have been found at least three razor blades on the floor.
Trivia: When Sam tells Dean that Luke Wallace's and Jenny's deaths are linked to some spell ("Three blood sacrifices over three days...") he shows him a book. On the book an illustration can be seen. It's a Gustave Doré drawing (one of the most famous Dante's "Divina Commedia" illustrators), which represents Dante and Virgil in Hell, talking to the damned soul of the heretic Farinata Degli Uberti (see Dante's Inferno, canto 10).
Sam and Dean come out of their hotel room to find the Impala splattered and splotched, most likely by the astronaut boy who got no candy. However, when the brothers leave the house after having driven directly there from the hotel and the school in the middle of a crisis, it is perfectly clean.
Sam: What about you? Find anything on the victim?
Dean: This Luke Wallace--he was so vanilla that he made vanilla seem spicy.
Sam: Once he's raised, Samhain can do some raising of his own.
Dean: Raising what, exactly?
Sam: Dark, evil crap and lots of it. They follow him around like a friggin' Pied Piper.
Dean: So we're talking ghosts.
Dean: Those little dudes are scary. Small hands.
Dean: Yeah, well, if you were a six-hundred-year-old hag and you could pick any costume to come back in, wouldn't you go for a hot cheerleader? I would. Mmm.
Sam: We'll stop this witch before she summons anyone. Your seal won't be broken and no one has to die.
Uriel: We're wasting time with these mud monkeys.
Dean: I mean, come on, you're gonna wipe out a whole town for one little witch. Sounds to me like you're compensating for something.
Castiel: The decision's been made.
Uriel: By a mud monkey.
Castiel: You shouldn't call them that.
Uriel: Oh, that's what they are... savages. Just plumbing on two legs.
Castiel: You're close to blasphemy.
Dean: (fighting a zombie) Bring it on, stinky!
Dean: I'm telling you, both of these vics are squeaky-clean. There was no reason for wicked-bitch payback.
(Dean eating Halloween candy)
Sam: Really? After that guy choked down all those razor blades?
Dean: It's Halloween, man.
Sam: Yeah. For us, every day is Halloween.
Dean: Don't be a downer. Anything interesting?
Dean: Zombie-ghost orgy, huh? Well, that's it. I'm torching everybody.
Dean: Well, are you gonna figure out a way to find this witch, or are you just gonna sit there fingering your bone?
Music: Just As Through With You (Nine Days)
Australia: November 10, 2008 on Channel Ten
Denmark: January 4, 2009 on TV3
UK: March 1, 2009 on ITV2
Sweden: April 26, 2009 on Kanal 5
Norway: May 7, 2009 on FEM
Portugal: June 1, 2009 on AXN
Spain: October 12, 2009 on AXN
Germany: December 14, 2009 on Sky Cinema Hits
Poland: March 26, 2010 on TVN7
New Zealand: March 31, 2010 on TV2
Czech Republic: June 25, 2010 on Prima COOL
Finland: May 24, 2011 on Sub
Slovakia: March 21, 2013 on Markiza
Dean: Umm, I'm Agent Geddy, this is Agent Lee.
Referencing Geddy Lee, lead vocalist for Rush. Lee joined Rush in September 1968, replacing Jeff Jones. The singer was born Gary Lee Weinrib in July 1953.
Dean: Agent Seger, FBI.
Dean uses the alias of Bob Seger, rocker primarily with the Silver Bullet Band and made it big with Night Moves, and later Old Time Rock & Roll.
Referencing It's The Great Pumpkin, Charlie Brown which originally aired in 1966, and is the Charlie Brown Halloween special. While the rest of the Peanuts gang celebrate Halloween, Linus waits in the pumpkin patch for the Great Pumpkin to appear.
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