“You can’t keep me locked up with a laughing person!”
The answer to how the new Doctor deals with a comedy romp is that he complains bitterly about it most of the way through.
Tom Riley as Robin Hood is very Errol Flynn, while Ben Miller as the Sheriff is very Alan Rickman. (Both Flynn and Prince Of Thieves are duly namechecked.) Just a little bit of deconstruction, all things considered.
The beheading and laughing joke was supposed to pay off with a sequence cut from the final episode.
Clara saves the day.
The Promised Land yes, Missy no.
Cheeky Patrick Troughton cameo.
Add robot knights to the list of figure we should get if CO could be bothered.