why is Apple being sued even if all they did was set down a box and say "hey consumers, good stuff will be in here" and "hey producers, stick your stuff in here".
I would argue that the customer shouldn't have to dig to find out who is responsible. From the customer's point of view Apple sold him the content and was the point where the text was presented. Now whether it is Apple or the publishers behind, is for Apple to decide whether they pass the buck.
In the example of Best Buy the relationship between the box and the store is a bit clearer, but if Best Buy has an advert saying something that incorrect and it has the Best Buy logo on it, then it is Best Buy's responsibility, even it was the publisher behind changing the offering.