If you're playing on a digital TV you should be able to reset the aspect ratio to 4:3 and get it all in as I remember.
Another way is to add the iMovie via the iMovie ➙ Share ➙ Media Browser ➙ iDVD slideshow import route
and then set the iDVD ➙ Slideshow preferences to the following:
This will play it all on any TV set. This is what it'll look like: