I've spent some time looking at the video and breaking it down:
The door opens, Lam entered from the left (where the outside panel for the elevator is evident) where one would stand waiting before the door opens.
Starting at 0:07-0:12 - When she bends down to press the buttons on the panel (considering that she wasn't wearing her glasses suggests that she may have been near-sighted). She pressed 7 buttons on the middle column, which reads from top-down: 14, 10, 7, 4, M, B, "Door Hold." But, the button for 14th floor didn't stayed lit after pressing, which means that she was on that floor (this is actually a 13th floor, even though they just don't label or said it). And, she actually did pressed "Door Hold" button, which kept the door open.
Bet 0:57-1:30 - when she walked out of the elevator, she was facing the big round mirror on the opposite side from the elevator and probably reacting to her reflection. And, at 1:08, she was leaning against the outside panel for the elevator (which could keep the elevator door open - I did this as a kid at a hotel, which did kept the door open).
Bet 1:34-1:51 - when she came back into the elevator, she pressed the same buttons over and over again, especially the bottom one several times ("Door Hold").
Beginning at 1:55 - she went back out in the hallway and leaning against the panel, and likely to be talking to someone. It's almost as if she was holding the elevator for someone and she was waiting outside. The way she was gesturing her fingers was a gesture of "list of things to do" - 1, then, 2, then...
Then, she walks away from the elevator...which tells me that she wanted to use the elevator, then walks away as if feeling a defeat after the "conversation" (which suggests that she was talking to a hotel staff to which that person saying something like, "I'm sorry, you can't do that, go back to your room" or something to that effect).
Then, the elevator closed and went down to 10th and 7th floors (you can see the button unlit after the door opens each time) before the video ended. Considering that no one else was seen on each floor as the elevator moving down suggests that this took place at night.
From the youtube page, there's a commenter mentioning the time gap:
Evo7IX 3 hours ago
### the time on the vid u can see from 1:15 is 11:22:XX:XX, on 1:20, time changes to 11:23:XX:XX, keep counting 60sec, time changes to 11:24:00:00 on 2:42, its weird the time way slower than normal! and then, 00,01,02,03,04 after 5sec,the time move to 11:25:00:00, means theres 55sec minssing~!and now thats the truth what i wanna know, where the hell is that 55sec vid?
...
Evo7IX 3 hours ago
***IMPORTANT*** guys, stop wasting your time, this video have been modified, there's a "most important" 55second missing from the video after elisa gone out of the camera. and i believe thats the most important evidence for this case, I dont know if police did or the police they didnt realize.
The other thought for the above issue is that the camera could be a motion-sensor camera where it will record once there's movement and unrecorded when there's not. If it's not a motion-sensor camera, then this aspect of the video was probably edited out for some reason (this aspect could show a staff member passing by and following her - just a possibility here).
Considering the two events that happened in 2011 (Singapore) and last month (India), a "maid" was involved (in 2011, a maid was found in a water tank; in 2013, a maid dumped a baby in a water tank). With the Lam case, it's very possible that a staff (or a housekeeper) is involved.
I took a look at the Google satellite of the hotel, and there's only
two ways to the roof: a locked door with an alarm and a fire escape (which one can get to through a window - though, it'll be nice to know which room she was staying in).
Now, due to the discovery of the body, the hotel became closed for service due to "water issues." And, they are adding this "mysterious death" to the list of dark history of the place:
_http://www.ibtimes.co.uk/articles/438781/20130224/canadian-woman-elisa-lam-death-cecil-hotel.htm
Serial killers Richard Ramirez and Jack Unterweger stayed in the Cecil, but many more people have died after checking in.
In the 1950s and 1960s, the Cecil was known as a suicide hotspot, as people leapt to their deaths from the top floor.
Among those who died are:
Helen Gurnee A woman in her 50s, she jumped to her death from a seventh floor window on 22 October 1954.
Julia Moore On 11 February 1962, Moore killed herself by jumping from a room window on the eighth floor.
Pauline Otton Twenty-seven-year-old Otton killed herself by jumping out of a ninth-floor window after a heated argument with her estranged husband on 12 October 1962. Otton landed on 65-year-old pedestrian George Gianinni, 90 feet below, and killed him.
"Pigeon Goldie" Osgood Retired telephone operator Osgood was found raped and murdered in her ransacked room on 4 June 1964. Her murder remains unsolved.
The other possibility is the "spot" where one would feel the "depression" or other negative energies as Lethbridge discovered in his book, considering the history of this hotel.
I personally don't know if she was on drugs, but she could be drunk. That's the other possibility haven't been considered (her erratic movements, slightly disoriented, etc. may reflect that...but I could be wrong).
