You didn't miss it, it wasn't there.
Interesting article none the less. I wasn't aware it was illegal. Seriously? Illegal? That's insane and also makes no sense. My daughter collected Trash Packs for a while. Thank god she stopped as each wave had 100 to collect and she stopped at wave 7. 700 of the little bastards to find! Each pack came with a flyer that showed the whole wave of 100. And her latest favourite, Palace Pets, does the same: a leaflet inside the packet showing the full wave. If the cardback cross sell is illegal then surely the fliers must be too? It works exactly the same way. In fact, if it's on the back at least parents can see what they're buying into whilst stood in the toy aisle. Tucked inside they won't see it until they get it home.
And as for illegal that's insane. Toy manufacturers can advertise on kids TV: the kid sat at home, away from the toy shop and in the safety of their home and away from temptation of new toys to nag their parents about. And yet now they can't advertise age appropriate toys that the parent can hold in their hand and make an informed decision about? Is this an EU piece of insanity or a home grown US special? Either way it's ****ing nuts.