On Disc 1 of Collection 6 of "Dark Shadows: The Beginning," (Episode 181), there is no opening tiltle sequence. The first scene, with Vicki and Carolyn, ends with them preparing to open the front door of Collinwood after hearing a knock. The scene fades to black and then there is a scene of them opening the door and letting Joe and Dr. Guthrie into the house. The familiar opening with the theme music and waves crashing is not shown. After the episode was over, I ran it backwards to make sure I had not missed something, and it still was not there.
If anyone has this episode on VHS, I'd like to know if the opening is missing on the videotape version as well. Alas, another mystery in Collinsport.