It’s interesting actually seeing the interior of the hotel. To do a very shoddy translation as my Mandarin is not that great: the video starts off with a brief introduction to the hotel, mentioning it is a really old hotel. The lobby and the halls look brand new, but the rooms are not that great and very simplistic in comparison (there are shots of both the interior and exterior). At about 4:28, he mentions five things he wants to investigate.
1. Does the door of the elevator not close?
2. How many buttons and panels are there outside the elevator?
3. Does the hold button work?
4. What can you see from the inside?
5. What can you see if you look outside the elevator?
Interestingly, when he pushes the floor buttons inside the elevator, the door does not close (in most modern elevators, pushing the floor buttons closes the elevator). That’s why in the video, when Elisa pushes the buttons, the elevator doesn’t necessarily close until later. Outside, there are only two buttons (up and down) and one panel on the wall. From the inside, as there is a mirror right outside on the opposing wall, you can see if anyone is outside the elevator. Peeking out, there are corners (marked in his graphic map) that show what you can and can’t see.