from a post in bluray.com:
"At around the 51 minute mark when Agent Smith approaches Neo in the park the movie freezes and then jumps several seconds. I tried playing the scene several times and the error occurs every time."
Apparently...the Revolutions disc has problems too. But there have been reports from other set owners that didn't have problems with their copies. But WB had offered a disc replacement offer for owners of the defective Revolutions disc.
Haven't gone thru the net to see what the Revolutions' disc problems are though.