I see. They are just bookends. Obviously it's a bit silly, but it's roughly a decent idea. Tardis memory? Keeps something, some essence of the passengers around in it's brain for some reason. . . Weird though that they know what happened to themselves after leaving the tardis.
The sets and filming though are utterly abysmal. It's filmed like an opening to jackonory. Davison at least made some attempt to interact/make something of it, (forcing the camera to engage) rather than just standing in front of it in a flat pebble mill studio lit two shot.