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troperville

Dean makes a deal with a crossroads demon to have Sam back from the dead. The Winchesters and friends try to stop the yellow-eyed demon from opening a gate to hell.

Tropes

And the Adventure Continues: Notable for being the only season finale to end this way.
At The Crossroads
All Your Base Are Belong to Us: The Roadhouse is destroyed by demons.
Back from the Dead
Beware the Nice Ones — Sam, shooting Jake multiple times
Book Ends — "We got work to do."
Came Back Wrong: The demon suggests this may have happened to Sam.
Cool Gun
Crowning Moment of Awesome — the yellow-eyed demon goes down!
Deal with the Devil
Depleted Phlebotinum Shells — the Colt
Disappears into Light
The Legions of Hell
Idiot Ball: It takes Sam a lot longer than it should to work out what happened.
Like a Badass out of Hell
Mind Rape — Jake
Never Found the Body: Ellen, who was assumed to be dead.
Not Quite Dead: Sam initially thought this was what happened to him.
Oh Crap
Series Fauxnale: The show had yet to be renewed by the time this episode originally aired, so despite a few lingering threads it would have served as an overall serviceable finale if the CW had chosen not to continue it.
Spot the Imposter: Bobby still makes his visitors drink holy water.
Weird West — the climax is in a cowboy graveyard, in the middle of a giant Devil's Trap built out railroad lines by Samuel Colt with five churches at the points that he also built.
What the Hell, Hero? — Bobby to Dean after he realizes he made a deal.