directors using colorful or "impossible" lighting to convey mood and meaning and beauty my beloved. directors making night scenes impossible to see for the sake of realism my beloathed.
because obviously the doctor is about to blame donna for spilling the coffee, but he catches himself, backs off and apologizes. and it's not him catching himself in a "this is a pointless argument because i'm right and you aren't getting that so i give up" sorta way- because in that beat after, he isn't irritated, he doesn't start trying to figure out a way to reiterate his point. it's him catching himself in a "that was the wrong thing to say and i regret that" sorta way.
it's him catching himself becoming another one of the voices in donna's head calling her a screw up.
Not-Donna: I see into your soul. I know everything about you. I understand what you’ve been through. And I am going to use it against you and take over your universe.
Not-Doctor: [crawling upside down] donna donna donna donna donna donna donna