I have had similar problems when adding content to my TimeCapsule and into iTunes and my Apple TV. It just seems a little buggy. Apple TV also does weird things when streaming, especially watching trailers. They take WAY LONGER and reload a bunch of times while watching for no reason.
Also, everyone remember that whole COMPLETELY REWRITTEN Finder and how FAST it was supposed to be? Why is it the when I start up my MacBook Pro and open the Finder the first time, it literally takes like 5-8 seconds just to load the application icons in column view???

It never had that problem before it was rewritten lol! Am I the only one???

Take a look at that Apple!