Among my friends, Primeivel Whirl is known exclusively as Primeivel Hurl. That's intentional, though.
I still think of the Pangani Falls Exploration Trail as the Gorilla Falls Exploration Trail, and Dinosaur! will always be Countdown to Extinction for me.
My biggest peeves are some of the restautant names; people always insist on trying to make them posessives. 'Ohana (apostrophe first, no S at the end) always becomes O'hana, O'hanas, O'hana's, or 'Ohana's. It's Polynesian, not an Irish pub!
Boma always seems to become Bomas or Boma's, Jiko becomes Jikos or Jiko's, and The Mara inevitably becomes Maras or Mara's (it's not run by Kang's wife!)
I also grit my teeth when people say or type the names of the two American parks mixed up or just plain wrong. The one in California is called
Disneyland, and the one in Orlando is Walt Disney World (simply calling it Disney World is acceptable to me). But I often see Disneyland used to refer to the Orlando parks, and sometimes I see Disney Land and Disneyworld, both of which are wrong no matter which resort they refer to.
Then there are the people who type my name wrong (Willcad, Wilcad, Will Cad, Will CADD - I even had a guy type it out Wildcard last week on another board). Oy! Just enough to get me all upset before I go home tonight!