I have discovered a curious pair of rules in the comprehensive rulebook. Specifically:
400.8. If an object in the exile zone is exiled, it doesn’t change zones, but it becomes a new object that has just been exiled.
406.7. If an object in the exile zone becomes exiled, it doesn’t change zones, but it becomes a new object that has just been exiled.
Section 400 is Zones - General, while 406 is Zones - Exile.
Now, I know that the same rule may be repeated multiple times throughout the comprehensive rulebook. See, for instance, 112.5, 209.2, 306.5d and 606.3 all stating that the loyalty ability of a permanent may only be activated if none of that permanent's loyalty abilities has been activated earlier this turn. However, apart from 606.3, they all say 'See rule 606, “Loyalty Abilities.”', and that's what I find typical for the comprehensive rules; the same rule may be listed several times where it is deemed appropriate, but there is always one "main instance" of the rule, and all other times it is mentioned, the reader is referred to that main instance.
Not so for the "exile an exiled card" rule. It is just stated, almost verbatim, in two different places with no references to one another. Is this a mistake? If so, is there any way (and point) to alert Wizards of the Coast of this? Would they appreciate said feedback?