HE’S SO HAPPY CAS IS BACK OMG HE LITERALLY JUST INCLUDES JACK WITHOUT A THOUGHT LIKE YES OBVIOUS HE’S PART OF THE TEAM, WHEN DID I SAY HE WASN’T? WHAT? yESTERDAY? THAT DOESN’T SOUND LIKE ME.
And Sam is just so relieved he doesn’t even mind his brother is basically embarrassing himself with giddiness.
From ‘the devil’/’Lucifer’s son’ to ‘half-angel kid’, that’s a pretty significant shift in terminology. Of course angel doesn’t necessarily mean good – pretty far from that – but it’s still a concept that has positive connotations for Dean because of reasons.
Dean a few days ago: I WILL KILL YOU YOU HELL SPAWN
Dean now: whatever nevermind we’re all monsters welcome to the family
Like…. honey. You’re so in love with the dude who just came back from the dead, it’s sickening.
Listen, Cas’s face doesn’t even make sense in this episode if you don’t assume that he can hear Dean’s music and he’s reacting to it with confusion and resignation that this is the man he’s fallen in love with.
It’s canon that Cas can hear music in people’s heads. He heard music in Fred’s head at the end of “ Hunteri Heroici.” So, of course, he hears the music in Dean’s head.