If the society voted for Mr. X to do a particular job or even if he is elected by unanimous consent, but the minutes don't reflect that, then they can and should be corrected. Be careful, however, about including comments from discussion in the minutes. The wording of your question sounds almost like that is what you are talking about. If, for example, the motion is "to paint the building" and someone asks who is going to do it, someone might say, "That's something Mr. X can do." It wouldn't go in the minutes because it isn't part of the motion, but a lot of people would assume he would, even though Mr. X may not have agreed to do it.