I think it's safe to say that one of the big appeals of Star Wars as a genre is that every time you go see a film or read a book or play a game there's always a good chance that you'll be presented with something new and different--the galaxy is certainly large enough that you can fly from one end and back again and see new sights both ways. In service of preserving that spirit, what sort of things have you concocted from whole cloth (Or shamelessly borrowed from elsewhere) that didn't previously exist in Star Wars canon (Legends or otherwise) just to make sure your players never felt too secure in their meta-knowledge? Starships, events, planets, lore, whatever.
EDIT: ****, this should've been in the Game Masters forum. That's what I get for posting while drinking.
Edited by Jace911