So my question is for ERA purposes is the error by SS THE third "out." Notice one batter/runner was out twice. He was "out" on the dropped third strike. Then he was out again a few pitches later on the double steal. So was the error by SS after that the end of any "earned" runs?

My apologies. I was reconstructing this from memory. The first batter walked and then stole second. After he stole, the dropped third occurred. However, he stayed on 2B during the dropped third. Then the double steal pick off.

1) BB, steals 2B on dropped 3rd (below) 2) K looking, dropped third strike (not a wild pitch). ADVANCES to 1B. Runner 1 goes to 2B. 3) ball - double steal attempt. runner 1 steals 3B. runner 2 (dropped 3rd runner) tries to steal 2B. Runner 2 Gets thrown out. runner 1 steals home on throw from C to 2...