For the trailers, yes, we assume that the trailers might make it onto the DVD, but you know what happens when you ASSume. The TV ads probably wont be on any release.
For the logos, yes, I could put the history channel logo on the cover and disc, but I also could put ...Lego, Lucasfilm, etc, etc. I dont like a huge jumble of logos on the artwork, so i left it a bit more plain. I always welcome others art to add.