From what I remember about SC, I don't think there was ever a $70,000 winner, but there were definitely at least two $25,000+ one-day winners, and both were before the board changes. (I seem to recall that, in addition to replacing the "always $5000" space with a changing value (although the values changed in a fixed sequence, not "randomly"), the highest value space in the first round dropped from $1500 to $1000.)
I do remember one question from the show (and not from the pilot): "What is the best-selling novel of all time?" The question was asked right about the time Gone With the Wind was going to air on TV for the first time, so all three contestants ended up guessing GWTW, but the answer was Valley of the Dolls.
-- Don