Mark, it's easy to rotate a MP4 video clip in QuickTime Player. I know you're using a MacBook with MAC OS X. The catch is you need to upgrade to QuickTime Pro, for around 20 or 25 US dollars. The rotation works well with just a little apparent distortion. There are probably other ways to do it, but this one will work.
Thanks Mark. You're not as dumb as you look. -- Mark