The ABC version was wiped with only one ABC daytime show (August 1968) existing as a black-and-white copy.
The 1980s version was reported in 2013 to have been destroyed in a flood in series creator Don Reid's house, along with its production materials and music. About 15 episodes (including Pilot #3, the premiere, and the Grand Finale) of this run are known to exist.
Screwed by the Network: The NBC version was ranked third among all daytime game shows as late as the spring of 1984. It was replaced that summer with Scrabble which would run for 5¾ years, occupying the same time slot Dream House had for the first three.
What Could Have Been: GSN tried to acquire the rights to rerun the 1980s series before it was revealed that a flood destroyed the master tapes. Whether the flood happened before or after GSN's attempted contact with Don Reid is unknown.
Sheridan's dislike stems from him being locked out of the editing room as punishment for bad test screenings (he did do studio-mandated reshoots, though).