That's good. As I said, I don't own those DVDs, so didn't know if they were on there or not. I wonder why Scooby-Doo has its original logo and not the others? Of all HB's series it must be the most oft-screened and therefore more likely to have the "new" logo.
For nostalgia's sake, it's definitely annoying, but I wouldn't choose not to buy a show I want if that's the only thing that has been altered.
Regarding Bewitched, did the earliest episodes ever have the Screen Gems logo? I noticed that on TV Land, the color episodes have it, but not the B&W ones.