It's interesting that the Haunted Mansion listing doesn't mention it's special holiday overlay, but the listing for It's A Small World does.
And speaking of It's A Small World, notice how Fastpass was available for it during the holiday season (see below.) Anyone out there have a Fastpass for IASW's holiday overlay? Those must be rare since they haven't issued them for years now! Tokyo Disneyland still sets up temporary Fastpass machines for their holiday version of It's A Small World.