In addition to what I said above, I guess my primary problem with the 1840 story is that the writers simply did not care to explain why anything happened.
Count me as someone who loves 1840. It has continuity holes, and the story seemed to change course as soon as it began (as did 1795), but I don't think it's fair to assume this was due to the writers not caring.
One possible explanation for the change in plotting could have to do with the availability of David Henesy, who went to live with his dad during this period. Tad is in Boston through much of 1840 though he was originally to have been a major character.
But the many MANY unanswered questions leave much open to speculation by fans, and over the years I've seen some intriguing theories on how the original events may have played out and how revised events might connect to the present.
SPOILERS for 1897: (cuz not all our visitors may have seen 1897 and that subject is, you know, off topic for this thread
)
For example, why did the ghosts of Gerard and Daphne start haunting the house in 1970?? Why not any other time? At least in 1897, Quentin's ghost was "released" by the kids discovering his room and doing various things for him. With Gerard's ghost, they just basically showed up one day and started making the playroom appear, with apparently no external cause. The only even half-reason is that Hallie had shown up, making the pair Tad & Carrie together again, but it still seems like Gerard's ghost should have had power and been able to cause trouble without the kids
It wasn't so much Quentin's release from the room that kick started his haunting because he was already communicating with the "children" before they found the room. I believe that what started his haunting was Amy's arrival, same as for Hallie.
Whoever heard of a ghost possessing another ghost (since apparently Gerard's ghost was actually Judah's ghost)??
Whoever heard of a linen closet changing into a much larger playroom and back again? It makes no sense in the physical world, but I think the idea of a ghost room is endlessly fascinating.
When Gerard's body died, I don't see why Judah's ghost would remain with him-- it seems like the his soul would just return to the Head or something.
The head was destroyed when Gerard was shot, leaving Judah with nowhere else to go. But why the ghost resembles Gerard and not Judah is anybody's guess. Though that Storm sneer is great.