On October 17, 1989 an earthquake struck San Francisco and sen the 3rd season of Full House into a confused spiral of postponed shows and put the whole season out of airdate order in some cases, thanks to the World Series airing on a date the Halloween episode was to have aired, pushing it into Michelle's birthday, Michelle's birthday into...you get the idea. Never assume the airdate is the date an episode takes place. You're being told an account of fictional characters. The storyteller has the right to insert things they just remember if you're hearing it verbally. So, you need to realize the air date might not be when they planned to have anything happen. And, it's really simple with some, like a Christmas episode that airs a few days before. But, when you watch with your brain working, you'llsee there's other stuff going on, too.