It's not just the disclaimer. Both Teaser and Trailer asks "Do you have Cats&Dogs?" and the trailer takes place in Brindleton Bay rather than a base game world, with some of the decor in the trailer being from C&D. There's a dog on the cover. So it's not got this blazing alarm, but face it, EA's not hiding that it's a good idea to have C&D.
Somebody's going to miss it, because somebody always does. Maybe they'll think it's a cheap version of C&D. Then they'll feel stupid and blame EA, because that's how people are. Maybe they just didn't see the trailer before seeing it in the shops.
I dunno. EA clearly doesn't want to be blamed if other people get it wrong.
