Over 40 years, George Lucas delivered one of the most memorable franchises in entertainment history - nurturing one of the richest fan cultures in the world. Yet, for all the success in the Star Wars universe, there are also a lot of questionable and downright cheesy additions that plagued the series.
Lucas' attempt to fit every piece of the puzzle into a complete and intertwined narrative subsequently resulted in especially controversial moments. For example: long-detested Jar Jar Binks returns in Episode 2 and plays a significant (albeit unintentional) role in Chancellor Palpatine's subjugation of the Senate; Han Solo steps on Jabba the Hut's tail in the Episode 4 Special Edition (after shooting Greedo second), and Hayden Christensen replaced Sebastian Shaw as the spirit version of Anakin Skywalker in Episode 6.
For Episode 7, Lucas won't be as directly involved, but if we are to see original characters return in the new trilogy, they'll come saddled with at least a few mistakes from series past - midi-chlorians, most notably.