Apparently, he was going to bring it up.

Skulduggery paused, and nodded once. "You're right." He walked back behind the desk, plucked the Santa hat off the room key hook, and planted it on Anton's head. "There. Now it's a gift being used. That fulfills one of your conditions." He turned to leave, then stopped once again and looked back over his shoulder. "For the other condition, you'll just have to follow me wherever I go."