Here's my list of myths
Great Rugby Laws Myths
(1) If a player falls on the ball, you do NOT have to let him up. (You can’t put weight on him, but you can compete for the ball straight away and if he doesn’t let go...ping!)
(2) If a penalty or free kick is advanced 10m, you CAN take a quick tap once the referee has indicated the new mark. This is such a handy one, especially if the ref knows it (can’t vouch for all refs!). The instant he makes the mark, you can go.
(3) A player in a ruck CANNOT handle the ball even if he is on his feet unless (a) he had his hands on the ball before the ruck formed, or (b) he is the scrum half getting the ball out of the ruck.
(4) You CAN be offside in in-goal.
(5) It is NOT obligatory to issue a red or yellow card with a penalty try
(6) You CAN charge the conversion of a penalty try.
(7) At an uncontested scrum the Number 8 CAN break off with the ball.
(8) You MUST NOT ruck players.
(9) A Mark CAN be called from a penalty kick or drop goal attempt.
(10) You DO NOT NEED BOTH “control” and “downward pressure” to score a try.
(11) You CANNOT score a try by touching a goal post above the ground.
(12) There is NO SUCH THING as “double movement” when stretching out to score a try, its simply “not releasing” if the player hangs onto it (same outcome of course)
(13) The captain DOES NOT have an automatic right to talk to the referee when he wants to.