I wonder whether Daryl Schaefer was ever contacted about possibly looping Grayson's missing dialogue.
Mr. Pierson also said that they still need to find an actress to cover Grayson Hall's lines for the deleted scene(s?) that would be restored. This scene or scenes would possibly be included as an extra on the DVD since inserting the scene would disrupt the sequence as it was rearranged by DC after cuts were made.
I think Denise Nickerson did have a cameo in HODS that was cut. If I remember correctly, she alluded to that in an interview on a PA talk radio special called Collinsport Revisited. I can check that when I get home, but I'm fairly certain that's what she said.
I read in an old issue of Castle of Frankenstein I picked up a month or two ago that Bob Cobert had a cameo in that scene (costume party), but I failed to spot him the last time I watched the movie.