I'm curious what episode of "Double Dare" aired other than the first one. Was that a pilot? They spent the whole half hour playing the front game and didn't get to the Spoiler round. The 10:30 episode was indeed the second episode, mentioned by Alex on air.
"Sale of the Century" was the first two syndicated episodes.
"Beat The Clock" aired the first two episodes, with the live band playing the theme in the lower key of d minor. I have portions of that second episode on audio tape, recorded from the original network airing in 1979. I somehow missed the first one.