Why the HELL is the door open?

I guess that it is during the storm, when it reaches the prometheus.... I'm not quite sur though...

Ooops : sure *

He doesn't. It's just clever editing in the trailer. What he actually says is, "why is that door not open". The reason is that when they are Bringing the infected Holloway back to the ship Janek tells them to have the doors open so he can receive treatment but Vickers over rules and tells the crew to keep it closed so that the infection is not brought inboard. Not as exciting or interesting as the trailer suggests. Prepare for disappointment.

@Corporalhiccups is correct. Janek says, "why the hell is that door not open" after contacting Prometheus and requesting medical assistance for Holloway. Vickers delays the opening of the door.

No way! So he wasn't even on the ship? Wow! So then what happens in the scene where he and Ravel are looking at each other in shock in the ship in which they play the line from the movie over? Tricky editing indeed... and yet they still showed us most of the movie. Ugh.