Although the flubs, bloopers and whoopsies are all now very apparent to us, when I watched DS during its original run, I just didn't see them. Maybe it was the innocence of youth. The only three that I remembered as a child were Barnabas mistating the year 1897 (he said something like 1895 or some such), Jonathan Frid walking across the foyer set with costume in hand during the closing credits, and seeing the fly buzz around Julia. Many decades later, when I watched the episodes on Sci-Fi, I kept wondering to myself as I could now clearly see the blown lines, the crashing props, the microphone booms, the stage hands, et. al., "how did I miss all that?" Ah, youth - it covers and forgives a multitude of sins.
Gerard