there’s no requirement that every answer given by two people in on the board.
Have you read the Family Feud bible?
No, but it seems probable that the second question of
this episode didn't get 13 unduplicated answers. Or 27 unduplicated answers in the third question of
this episode.
The current version of the show is even more blatant about it, sometimes using questions where only 60-some respondents' worth of answers are displayed on the board.
2. Probably not so much a problem in its current iteration, but what happens if one ran into an answer that's considered...shall we say, inappropriate for air? An example for this might be "Name something that people ride".
You're right that the current version would go ahead and display that answer on the board.
I don't know how I'd go about looking it up, but I remember seeing a Dawson episode on Buzzr where the question began with "name a bird" and one of the answers up on the board was "bat." So I suspect that the survey results are the survey results, for better or for worse. As has already been pointed out, if the show doesn't want a weird answer to be displayed on the board, the answer threshold can be cut off before that point if it's the main game, or the question can be used in Fast Money.