Yes, despite its goofs, the original "Dark Shadows" was a great TV series, and I enjoyed it immensely. But, isn't that the show where one of the actors bumps into one of the walls of the set, and though it is suppose to be a solid wall, the wall wobbles?
Yeah, I think I noticed that a few times in the series. People will be in a room with stone walls, yet someone will bump into one and you can see it wobble. At one point, there's a very short scene in the old house, and the stairway is missing

Must not have gotten the set fully assembled before that scene was filmed.
One of my other favorites in when Dr. Julia Hoffman is talking to Nicolas Blair about the hand of Count Petofi. But she flubs her line and asks him about "the book". "The book?" he responds, "You mean the hand?"