DarthShackleford said:

Unfortunately, I don't have that shirt in particular, but I am going to try to make time to wash mine so I can wear it - I already wore it this week.

As for what to look for, I'll be specifically noting the fanfare, the beginning of the crawl, Jabba if he's even there, Luke's saber on the Falcon, the corridor of the detention block, and the language of the tractor beam settings. Other than that, the Mos Eisley and BoY CGI shots will be a dead giveaway. There's also that new rock in front of R2 if it's somehow kin to the BD. Coincidentally, I downloaded and watched Harmy's Respecialized earlier today, so I think I'm good. Anything else I should look for?

I would give this article a read before you go

http://www.dvdactive.com/editorial/articles/star-wars-the-changes-part-one.html