One of the nice features of iTunes Movie Rentals is the ability to watch the movies you rent on a portable device like an iPod or iPhone. Apple has made the process of moving rented movies to your iPod or iPhone very easy. Here’s how you do it.
To start with, make sure you have enough free disk space on your device before you start. For most iPods this likely won’t be a problem. For iPhones, though, since they have less storage, you may need to delete some songs or photos to make space. When you’ve watched the movie you can always put them back.
Once that’s done, begin by syncing your iPod or iPhone with your computer.