Interpretation is the annoying thing from my perspective.
The rule (or law however they are referred to) will be written down in black and white but each individual referee will then add to their own interpretation to it so you end up with matches that appear to be officiated under completely different rules to the one the week before based on the ref and either how card happy he is or which parts of rules he chooses to apply when and where.
For example, you can commit the same foul on half way as you do in the box and not be penalised for the one in the box because the referee doesn’t want to give a penalty for it. The following week, a nothing challenge in the box will be given by that ref who basically blows every time someone falls over (depending on who they play for).
