I know it sounds crazy, but this is how I was initially envisioning the attraction.
The fact of the matter is that "The Legend of Sleepy Hollow" segment from The Adventures of Ichabod and Mr. Toad is still fondly remembered as one of the creepier pieces of Disney animation thanks to its rendition of the Headless Horseman. So, making this something of a "haunted house" attraction made sense. However, considering this is Disney, there'd surely be complaints if it got too scary. So, I tried to think about the elements for the attraction to fit this.
For instance, there are no scare-actors in the attraction. All of the appearances of the Headless Horseman would be done with essentially 2D cut-out figures, given briefs reveals in light. There would be no actual violence depicted in the attraction. Even the covered bridge scene wouldn't have anything actually thrown at guests. It would simply be a hidden air jet, positioned to give a burst of air around the head and shoulders. The reason for that small scare is that I feel like the shot of that jack o'lantern flying towards the camera is such an iconic moment from the short, but there's no realistic way to depict it. Thus, we instead use air to suggest that it just narrowly missed us as we run away from the Headless Horseman and head to the other side.
Besides that, it is all lights, sound, and mood. I tried my best to edge the line of a "haunted house" attraction, but still keep it within the Disney parameters.
Meanwhile, I've gone ahead and updated some of the naming in the queue and basic attraction logline to reflect the Harbortown USA naming.