1. Is Tarkin actually Vader's superior? It seems to be the case from the initial Death Star scenes. I don't think so, it's just he's the boss on the Death Star, and Vader respects that.
It's not that Anakin designed and built him from scratch, he merely put him together using spare parts from Watto's shop, and he tweaked some of his programming as well. 2. What type of propulsion system powers the Death Star? It seems to get around pretty quick but there doesn't seem to be anything powering it. A good one? 
Imperial Credits by that point I think. Han isn't a Tatooine local, he is just making a stop there.8. If 3PO was created by Anakin, why does it look like he's mass produced with several other similar bots sprinkled throughout the Universe? Was he a kitset? or did Anakin build the prototype that was subsequently cloned en masse? (I have to admit, I haven't watched much of the prequels so that one's probably slipped by me.) 3. There's no telling just how long it takes the Empire too find the hidden Rebel Base on Dantooine, but it sure seems to me it takes them a very short time indeed. After all the base is deserted. Wouldn't a deserted base would be a lot harder to find than one that's inhabited. I don't know I haven't looked for too many bases myself.
A parsec is a unit of distance here on Earth too, and there are two possibilites that have come up. Lucas says Han is just a blabber mouth who speaks well above his knowledge (ie: he doesn't even know what he's really talking about), or he finished the Kessel run in the least distance possible.7. Obi Wan offers Han two thousand up front, and fifteen when they reach Alderan. What exactly is the currency on Tatooine, or the Star Wars Universe in general? 4. What's the purpose of the Trash Compactor? Surely it's more economic to just dump your trash out into the endless vacuum of space, instead of wasting precious energy on crushing trash. They crush it into big blocks so when they launch it out into space, it doesn't just get caught in the Death Star's gravitational pull and litter the surface of the space station.5. Does Biggs actually tell Porkins to eject just before he bites the big one? What good's that gonna do him?
Presumably the whole cockpit ejects with him and then they can pick him up after the fact if they can find him. At the very least it would have prolonged his expiration time.6. What exactly is a parsec, and why use that terminology in SW, after all they do also use minutes, days and seconds.