I had an incredibly rude interviewing experience. It was probably one of the worst interviews I've ever had despite a glowing employee referral. A couple of the employees seemed to have huge egos, were arrogant, and were prima donnas.
Overall the interview was straightforward. They started off with a phone screen, they moved on to a timed coding test, then an onsite interview. The interview was typical white boarding questions and they had one person from product and one designer to round it out a bit.
Be prepared for lots of crunch if you join Lucasfilm. Their *required* core hours currently are 9 am to 7pm Monday through Friday so that is already a 45 hour work week assuming a 1 hour lunch. Many of their employees talked about staying later 8pm - 9pm. Be prepared for long grueling hours. The benefit though is you get to work on intellectual properties such as Star Wars!