In theory, it's intended, as I didn't want to cause a bottleneck for the scenes at night. I might have to check if there are any weird/incompatible scenes, however.
I'll fix the bug and typo ASAP. This one is actually a remnant from an older version of Ariel, where she would show up at your house to invite you, and so she had to disappear if you refused. I had removed the code to make her become uninteractive, but it seems like I forgot to keep her visible. XD
I'll make sure to fix the collision with the bookshelf as well. Thanks for the report!