Plotholes
Man I just love rewatching the show and noticing all the little plotholes, inconsistencies and retcons. 8x21 is a fun episode but you're telling me Crowley can erase Kevin's short-term memory and make him forget he'd been kidnapped, but he can't see in Kevin's memory where he'd hidden the tablet? So Crowley can edit Kevin's memory but not view it? Even if so, in this very season Crowley had no problem with burning off Kevin's mom's anti-demon possession tattoo to possess her, yet he doesn't think to do that to Kevin to see his memory? I will just choose to believe Crowley organised all the theater in 8x21 to realise his dream of directing lol.
Another thing I noticed is how in s6 when Dean gets turned into a vampire he's very attuned to human smell and forbids Sam and their grandfather from going with him to the nest because vampires would immediately clock them, yet in s8 he easily strolls into a vampire nest with Benny and simply hides from the vampires behind corners and walls.
What are the funniest/your favourite plotholes from the show?