Thought the Doctor's threatening Ashildr was compromised by the fact she had no problem tying him up to a chair in The Woman Who Lived, though I suppose the Doctor (like in The Family of Blood) brings hell (on those who make him angry) in different ways.
The idea of trap streets were clever but I was anticipating an ending like Mummy On The Orient Express where the Doctor would have then taken the tattoo and somehow stopped the raven, which made me wonder whether the Doctor could have taken the hit and regenerated. Perhaps Jenna should have quit at the end of Death In Heaven, rarely do companions just decide to leave (apart from Martha) and I thought that was better.
The Doctor's purple velvet jacket suited him a lot better than the hoodie, they don't seem to be able to decide on a costume for Capaldi's Doctor they're always changing it so much (must have been about ten or fifteen variations).