I don't remember any difficulty fitting on Splash Mountain so I'm going to say no (at worst it was likely a snug fit but most rides were)... If it helps for comparison's sake, I'm 5'10 and about a size 16/18.
Most rides didn't exit into a dump shop which I found interesting. There were often shops nearby that had themed merchandise but not like here in the US. I did get a Beauty and the Beast book-shaped tin that had candies in it, I just can't recall which shop I grabbed it in. I did not do very good note-taking for my souvenirs sadly. I do feel like I saw a good bit of Beauty and the Beast merchandise around though especially since the ride is so popular.
I had wanted the Beauty and the Beast popcorn bucket but since I ended up buying the pretty lantern at a merch cart just outside of Fantasy Springs, I decided against it and was looking for the Tangled popcorn bucket. But alas I did not get the chance to get it.
We were honestly really lucky to get on Frozen, considering that we never managed to line up as early as we should have if we wanted a good shot at it.
I'm so glad you enjoyed my trip report!