Another thing i liked about classic drwho is that he actually used SCIIENCE to solve some of his problems instead of just waving the screwdriver, rearanging some cables and flicking some switches.

There was a scene th the fifth doctor where hes stuck floatin space and uses a cricket ball to bounce himself back onto a spaceship which blew my mind more than any sparkysparky mumbojumbo in the new series. These days the problem would probably be solved with a companion turning on the tractor beam or someghing