I noticed that a door on the second floor and a door on the first floor of the Ragnarok lead to the same hallway.
In other words, you can enter a door on the bottom floor and continue through the following doorways without any elevation whatsoever, and then walk out a door on the top floor. I'm finding it hard to describe what I mean, so hopefully you understand.
Did anyone else notice this? Is it just a poorly thought out design?