It seems like every Simpsons halloween episode has the official title "Treehouse of Horror" (followed by roman numeral), while until at least a few years ago the on-screen title said "The Simpsons Halloween Special" (again, followed by a roman numberal). Does anybody know why the various halloween specials had the alternate "Treehouse of Horror" title when it wasn't actually on-screen until a few years ago? It seems like in recent years they also changed from having roman numerals to having regular numerals in the title. I also wonder the same about "Simpsons Roasting on an Open Fire", which had the on-screen title "The Simpsons Christmas Special" (which was also used on the VHS box).
Also interesting how they always have "Treehouse of Horror" in the title. The first one is really the only one where "Treehouse of Horror" is appropriate, as the linking scenes take place in the treehouse. In the other halloween specials with linking footage, the treehouse is nowhere to be seen. They could have had titles like "Simpsons Nightmares", "Halloween Party", and "Museum of Horrors".
Also interesting how they always have "Treehouse of Horror" in the title. The first one is really the only one where "Treehouse of Horror" is appropriate, as the linking scenes take place in the treehouse. In the other halloween specials with linking footage, the treehouse is nowhere to be seen. They could have had titles like "Simpsons Nightmares", "Halloween Party", and "Museum of Horrors".