We love this movie too---but sorry, we didn't see so much as a reference ot it our whole trip. There were several times that I though they could have tied it into something--like the boat ride in theLand you go past a farm and I thought how great it would have been to see some of the characters there. No, nothing.
There are no meetable Home on the Range characters anywhere. The only thing I can remember is at the 2004 Halloween parade, they had a Home on the Range float with the cow (sorry, never saw the movie yet, don't know the name!) in it. It was not in the 2005 parade (Clara Cluck took over the float!). Sorry for your DS!