yeah I am all for keeping the batcave secret, so letting in greek demigod and girlfriend and kid was a mistake early on, now we know that the batcave can't be tracked, hopefully season 9 sees a garage for the Impala.

Missing the Grand Canyon ref is a bit sloppy!they have to get someone on writing team to catch continuity errors.

I think they only had to kill everyone in one Biggerson's to get Cas to stop, not all of them, they knew eventually he would come back there.