It's few and far between for shows where the entirety is shot like that. I wouldn't be surprised if isn't simply a case of someone's monitor being set to a resolution with a ratio with more vertical space than 16.9 and bars get added in whatever media player they are using rather than the player stretching the image out of it's aspect ratio.
Anyways, this series is actually like that for the entire time. Just tell the user to crop their images. If they don't know how, there is a free program called PhotoScape that will let them batch crop everything all at once.