I have this same issue when trying to sync tv shows to my iPad. I've tried the various configurations of options within the tv shows tab (setting up sync), but particular shows are not syncing to this device. I have also double/triple checked that I'm on the same iTunes account...and logged in on both devices.
I can watch the shows on my computer (Mac-Book), but they just don't show up on the iPad.
This is particularly frustrating, as I've purchased these particular shows for my kids to watch on an upcoming trip.
Also, I've searched the other threads on this topic and followed the various instructions with not success. Assistance on this is GREATLY appreciated.