Unfortunately, there are already frequent reports of technical problems with these discs. Apparently Universal has had problems in the past with DVD-18 discs. My Panasonic DVD player choked on chapter 4 of the theatrical cut, but the cheapass $45 KLH player I bought at Best Buy two years ago for our bedroom plays it just fine. I'll probably take it back and request a replacement anyway.
Watched the theatrical cut tonight. I'll give the extended cut a spin tomorrow.