It's kind of fun watching Gerringer in the role of crusading, moralistic Dr. Woodard, since my first exposure to him was when he played Del Emerson on
The Edge of Night, a hammy con-man who was barely able to stay one step ahead of his scheming.
I recall Dennis Patrick being asked back to play Paul Stoddard in that awful Leviathan storyline, with the producers ignoring the past story of Jason McGuire and Paul Stoddard being co-conspirators/friends. Given all the crazy ways they created multiple roles for the main cast, this was not all that odd.
Speaking of the TelePrompTer, I always assumed it had a key role in making Julia Hoffman so "introspective," squinting while saying her lines, so frequently looking in the opposite direction of the character she's talking to. I guess on the Old House set she could blame it on the bad lighting.
In the same vein as Louis Edmonds's return to the set
sans pants, there is the episode where they HAD finished filming the scenes, but needed to do the closing "beauty shot," where they superimpose the credits over a shot of one of the (empty) sets used in the episode. The camera was rolling and the names were scrolling up the screen when suddenly Jonathan Frid dashed across the set, putting on his jacket to leave. He was so eager to leave that he did not notice they were filming. They capture the look on his face when he realizes he's walked into the shot, and of course he quickly tries to get out of view. I can't remember if the whole shot was broadcast (I've seen it in youtube clips but can't recall seeing it at the end of an actual episode) but knowing them....it probably got left in.