Of COURSE this is a Moffat episode. Maybe Clara has something to do with the Angels. Moffat did say that the seeds for Clara's existence were sown years ago.
Omnomnom Kathy Nightengale's time energy.
Did Kathy steal Martha's jacket?
Yep, that's DT for ya. In places he shouldn't be, like easter eggs.
There's some substance that is "quantum locked"...it's something radioactive, and it only decays when something is looking at it.
