The hitchhiking ghosts are another story entirely. doombuggies.com has a FANTASTIC behind the scenes section on the Haunted Mansion... I actually just reread it on Friday Night, and picked up a few new ideas... (always the propbuilder!) I think you would probably have to build your own hitch hiking ghost, unless you have a LOT of money... but you can get some insight at least on what goes into creating them, and how they are used...
well Mr. Grimsley I just typed in hitchhiking ghosts haunted mansion and pics of them came up, one is cousin huet and one is brother dave and they are the size of a child, so they're not huge but they're pretty neat, also they have blue lights built into the bottom that shine up at them, it's pretty neat.
MandatheWitch the two tombstones I am looking for are:
REST IN PEACE COUSIN HUET we all know you didn't do it
DEAR DEPARTED BROTHER DAVE he chased a bear into a cave
but I want the I think 2006 editions ones which lthe face on the tombstone lights up, the newer ones are just stone looking and not as eerie