ipod touch 2nd generation videos from itunes not going on it?

I recently inherited a 2nd generation ipod touch. I know its old and outdated but I thought for sure I would be able to put the videos I bought from itunes on it. Some will go and some will not. Why is that? I get a message saying they are not compatable, I wasted my money then!:confused::confused::confused:

via iLounge Forums http://ift.tt/1wh4eAh