Ok, some bits of much-loved 'fanon' which get sort-of ruled out by tonight...
Huge amounts of Virgin/BBC books continuity. (I refer the honourable gentlemen to the past posts regarding Mad Larry.)
The Doctor wasn't generally called the Doctor until Ian and Barbara started calling him it in the absence of a name.
When the Doctor stole the TARDIS, it was like running off with a company car - he took the TARDIS he'd already been using on official Time Lord business up till then.