Justin,
Thanks for correcting me, I guess that the 99% sure meant pretty much nothing. ;)
Greg,
I guess you are referring your comments to Sam instead of me like you addressed them to because I bought Mulholland Drive and it is one of my favorite movies and DVDs ever. ;)
-Eric
I am 99% sure that this means it is the theatrical version of the film as opposed to the "unrated/director's cut version" that is also available. So really nothing is edited out of the version that was rated R but it is edited compared to the director's cut of the film. But I can not vouch...