For you seasoned Mansionites, this post starts out with stuff everyone knows, proceeds to stuff a lot of people know, goes from there to something not too many people know, and ends up with thoughts that no mortal has ever thunk before. Ever.
So don't bail early.
(Not only that, but dig on the spectacular new artwork discovered only in October of 2015!)
The Flying Dutchman painting in the changing portrait hallway has remained constant in both its appearance and its position from the Haunted Mansion blueprints down to the present hour. Not that it hasn't had a turbulent history. Like all five of the paintings, it originally changed back and forth with a lightning flash effect, but sometime within the first few years, the paintings went to a slow morphing effect, reportedly because it was found that the lightning effect could trigger fits for people with epilepsy. It stayed like that until January of 2005, when the new, higher tech versions were installed. The current lightning effect is a throwback to the original presentation.