It turns out, Scrooge had swapped all of the presents out with coal because he thought of it as a more "practical gift"—part of that long story I mentioned! Not knowing that only naughty kids get coal! But he realized that was wrong, which us why they came back to the mansion!

There was very little time left in the night left for just one sleigh to go to every house, but Scrooge had a plan himself! Everyone else in the mansion each rode on a reindeer, and we split up across the world in order to deliver the real gifts!

Also it turned out Santa was faking that injury in a bid to get Scrooge to come out of his shell. Which worked, because now Scrooge lets Santa come into the mansion whenever he wants! Just as long as he uses the front door.