Hmm... The Hypermatter macguffin (can't remember off the top of my head what it's called. HMRI?) could be something complicated and mechanical looking. Do you have any spare car parts or computer parts. Just hand it to them when they buy/steal it.
Are your group of drinking age? After the group initially disposes of the gamorreans in the cantina, and them all a pint of "Correllian ale" (their favorite beverage of choice. Adult or otherwise.) The original adventure calls for the bartender to be very terse with them, but you can twist things up. The bartender is secretly being bullied by Teemo and forced to pay "protection" money. He was happy to see his thugs getting beaten and offers a free drink to the heroes.
For the opening crawl. If you have a laptop available you can stick the text of the opening crawl into one of these generators. Seeing the text put to music in true Star Wars style will put them in the perfect mood.
The adventure is pretty straight forward. Not sure of what else you could inject into the game as written. If I think of something else, I'll be sure to post it.