Sob, wail, bang bang bang (my head against a wall). The way to handle this...and all other myths/frequent mistakes is to tell players. Not on the pitch, not immediately after a whistle, but before they even get near a game. We are the best collectors of information (we see the mistakes being made) so we are in the best position to disseminate and distribute that information.
When I ran our society's website I realised what a vehicle it was for getting the information out and thereby avoiding players getting caught out. However, the website is only singing to one side of the congregation. What if there was a players' page which gave simple heads ups about frequent mistakes and misapprehensions. (Eg " A couple of times this seasons players taking the conversion have tried to do it with their heels; very impressive but it is against the laws so best not do it that way") We can ask that all players/coaches/even spectators read it... I can hear a few guffaws here but will press on because then the problem has been moved away from us onto those who failed to read it. It can become part of a player's routine.
I prepared a few explanations of common held myths and misunderstandings which I used at a couple of training sessions, and it worked well. But how much better if each society kept a running page on myths and misunderstandings which each player can read at his/her leisure.
I could post a couple of the examples if anyone is interested
