I do deduct points for answering a question wrong. So let's say if 5 people did say "Alaska" on #20, then instead of every person receiving 4 points, they would now only receive two. (Points will be cut in half.) Then if 3 people said a correct answer, then each person would receive two points as well.
Opinionated questions like the marriage one and the best/worst months are of course not subject to the rule since there is no right or wrong answer.
And when you don't have an answer or don't know, then no points are received at all.
Oh, and now there is one Latin American country that was mentioned more than once so kudos to them!