Playthings - S2-E11
Corrected entry: When Sam is throwing up in the bathroom, his right hand is on the toilet and the cast is not on. In the rest of the show, his right hand is in a cast.
Supernatural (2005)
1 corrected entry in season 2
All Hell Breaks Loose: Part 1 - S2-E21
Continuity mistake: Before the Roadhouse fire, Ash and Dean are talking on the phone. Ash looks at his watch, on his left hand, it says 8:10, and has a black dial/face. As Dean and Bobby go through the rubble, Dean identifies Ash by his watch. Still on his left hand, it is now upside down, evident by the crown of the watch (used to move the hands of the watch) which previously facing his hand, is now facing his elbow. Also, the dial/face of the watch is now silver instead of black. This is a different watch, and was inadvertently put on the burnt arm upside down.
Dean Winchester: Driver picks the music. Shotgun shuts his cakehole.
Trivia: The inscription on John Winchester's gun is Latin, translating to "I will not fear evil."
Question: Why did Sam just stand there and watch Dean get turned into a vampire? And then smile about it?
Correction: It's Dean looking at Sam's reflection in the mirror. It's clear when you see the scene with Dean in it. The cast in on the other arm.