the implication that the doctor can hear non diagetic music means the fact that they can't recognise the master is even funnier. babe this mysterious stranger is not your new bestie there is a minor chord playing right now
my most recent random thing ive been thinking about is the idea that Doctor flirts with Rose in gallifreyan the way some people flirt with their partners in their home language even though their partner doesn't speak it and i have been obsessed with this thought ever since