That is very cool. The only downside is that The Sandman doesn't look like Neil Gaiman in any way. I was hoping that he would in that Straczynski did name the Gaim from Babylon 5 after him and this would be a way to directly reference him in a children's cartoon, which I'm greatly in favor of.
If you haven't gotten the first volume of Ghostbusters on DVD yet, get it. J. Michael Straczynski does a bunch of introductions and a few commentaries.