Mr Toad also seemed to indicate you were playing the role of Toad himself, I don't believe he actually appears in the ride at all (except in statues or portraits). Makes sense given the fact that you're the one driving like a maniac and end up getting killed and sent to hell. Snow White also lacked the main character until 1994, when it was closed for an extensive rebuild to add in Snow herself and make it somewhat closer to the Disneyland/Paris versions.
I don't think Peter Pan has ever changed though, I didn't visit prior to the 90's but i've never heard of any substantial changes to the show scenes being done to WDW's version. I do think Disneyland's got an overhaul in 1983 with their New Fantasyland, but Orlando's is still very dated to the 70's.
The beginning scenes had most of the major differences.
1- The first long hallway after load was different. Currently this hallway has windows on the left side and portraits on the right wall. Lightning flashes from the windows which causes the portraits to morph into spooky imagery. But previously this was a windowless hall, both sides were lined with a ton eerie looking portraits. The eyes in these portraits followed you and glowed evilly.
2- The "Escher Stair" scene (the one now lined with abstract upside down and sideways staircases and mirrors) was a very dark room with more ordinary stairs. There were some rather large spider webs in the room with some also very large spiders in them.
3- Leota's scene is largely the same, but her ball didn't used to float and was fixed to the table.
4- The attic had some changes and was somewhat scarier. Instead of portraits where the groom heads disappear, there were very loud jack in the box ghosts that would pop out of boxes to startle people. Much like the ones still in the graveyard (though much noisier). The bride was also substantially different. The bride has actually changed several times over the years. But she never spoke in any prior version, she just silently held a candle and leered at guests with glowing eyes and a visible glowing beating heart. Her original face was apparently visible and skull-like, but early on she was changed to have a dark non-visible face. You can see the multiple brides used in this image (the second one is the one I grew up with and my personal pick for its subtle "fear of the unknown" style of creepiness)-