Episode One: 1)I'd forgotten that this was Jo's first trip in the TARDIS, and how freaked out she was.   2)The director confesses in one of the extras that the effect of the Doctor's (and later the Master's) TARDISes "blinking" in and out instead of fading in and out was actually a mistake on his part. While he'd worked on a number of Doctor Who  stories prior to this, he'd never actually seen th…