Looking over this list I thought of something to add. Forgive if this is already up on the board elsewhere. First is the even more overt references in the ongoing Hellsing OVA than was used in the original anime. Now, so far I've only seen the first four episodes (the only ones that are in English yet), but instead of just calling Seras Victoria's gun the Harkonnen cannon, she is actually visited by the spirit of her gun, who is obviously supposed to be Lynch's Baron Harkonnen (picture attached). I was also going to mention the Grim Adventures of Billy and Mandy references but a quick check shows someone else already pointed those out. By the way, I'm new to this forum though I've been watching it some since I found it a while back.
