Some unchecked smart playlists syncing
My iTunes is set to sync only selected playlists with my iPhone. While all of my checked playlists sync, so do some of the unchecked playlists as well. The only unchecked playlists that sync are smart playlists. Also, not all of the contents of the unchecked playlists sync. For example, one smart playlist has over 1,000 tracks on iTunes but that playlist on the iPhone only contains 11 tracks.
I thought perhaps if a track was contained in a checked playlist and present in an unchecked playlist, iTunes was forcing the appearance of the other playlists on the iPhone. While I still think there's a connection, spot checks show tracks which exist in checked playlists appear in other unchecked playlists which are not present on iPhone.
Running iTunes 8.0.2 on the Mac, 1st gen iPhone version 2.2 (5G77)
2.5Ghz MBP, 1.42Ghz Mac mini, Mac OS X (10.5.5)