The return on Lily and Marshall, but only after he dates the woman who has "crazy eyes". Well according to Ted and Sworley anyway, although there wasn't any real evidence of her craziness until the very end anyway.
This show seems to be very good when Ted and Robin are in the background and when the other 3 are the main focus or when the story is just about Ted or Robin. It feels like the writers know that they might as well make the combination of Robin adn Ted slightly off-kilter since they aren't going to work out anyway.
This episode is just another reason to show how great Alyson Hannigan is.
Loved the end bit with the Cheers gag.