One day, I was in a Toys R' Us. This was before PMTTYD (Paper Mario The Thousand Year Door) came out. I saw someone playing PMTTYD there, and I noticed that there was tall grass in what looked like Petal Meadows. When you went in the grass, you can barely see yourself, and enemies were lurking in there. When I finally got the game and beat it, I remembered that version and tried to look for the tall grass area in the game. Unfortunately, I didn't find it, thus making me believe that the Toys R' Us version I saw was a beta/prototype.
Besides PMTTYD, I also picked up a GBA there. It had MALSSS (Mario and Luigi SuperStarSaga) in it. So, when I turn on the game, I appear in Stardust Fields, the first area in the game besides the Mushroom Kingdom. You know how there is a building separating the Mushroom Kingdom side from the Beanbean Kingdom side? Well, I was able to go into the building and appear on the other side without the guards making me play the jump rope game (forgot the name). I found it strange that I was able to go back to the Mushroom Kingdom side, because it wasn't possible in my copy of the game. Besides that, there was also no pipe on the ledge to the left when you first go into the Beanbean Kingdom side. Yet again, this led me to believe that this version was a beta/prototype.
If anyone here doesn't understand what I said or knows anything about these versions, please tell me.