CHUCK!! Someone mentioned Chuck! Next thing you know, they'll remember Adam hanging out in the pit with Lucifer and Michael.
Cas was back!
Crowley!
"Are we on a space ship?" BWAHAHAHAHHA.
shiny, winged!Castiel!
Slice of Kevin, heh. (Although, poor Kevin!! That kid is tough, let me tell you.)
Naomi as Metatron??
Things I didn't like
The storytelling, particularly the flashbacks, was actually really confusing. Or else I'm just slow, because I didn't really get that this whole time Dean was trying to convince himself it wasn't his fault, rather than actually blaming Cas for letting go...which was the actual case. What.
The episode generally felt choppy.
Things about next week:
I remain unimpressed by the return of comedic relief!Castiel. Didn't we get over that in season 5? :/