I only sync my photos from iPhoto (and videos) to my phone from my computer through iTunes as 100% of everything else is from the cloud (no music as I use spottily) and I don't use any iTunes store media such as movies/tv shows. I get a "iTunes Sync: 6 items could not be synced. See iTunes for more information" pop-up on my iPhone after the sync is complete. I look at my iTunes and there are no errors and clicking around I can't find this sync error anywhere on my Mac (Mountain Lion and latest iTunes). 