The difference between then and now.
Follow
this link for some
very in-depth arguments surrounding these exact issues, but only if you have a solid afternoon to burn and a strong cup of coffee at hand. Things get into really detailed textual analysis by page three.
To be fair, I think someone later started a thread refuting a few of the lines of discussion put forward by yours truly, but I never took a good look at it and can't find the link at the moment.