Corrected entry: Throughout the show, the doors on the inside of the TARDIS (white with circular panels) are different from those on the outside (usually blue police box doors). Numerous shots disprove the notion of two sets of doors. The most obvious incident is the shot near the beginning of the Sensorites that tracks out through the TARDIS doors.
Corrected entry: When Doctor Who mentions his age, it seems to vary enormously between stories. In 'The Tomb of the Cybermen', the Doctor (Patrick Troughton) tells Victoria that he's 450 Earth years old (Since Gallifrey's other qualities are Earth like, and since the Doctor continually boasts of his age to humans, we might assume that there's not much difference between Gallifreyan and Earth years). However, by the time of 'Time And The Rani' (in "real time" 20 (Earth) years later) the Doctor (now Sylvester McCoy) claims that his age is '953'.