In the movie Inception when Cobb is dreaming about his wife Ariadne enters his dream and lands up in an elevator with each floor containing Cobb's memory of Mal.
In this scene Ariadne enters the elevator, hits the B button and lands up in the hotel memory. Following is the screenshot of her in the basement level.
Notice that the elevator's door is left open. This is a manually operated door and anyone who would've used these will know that the elevator will not move unless the door is closed by someone.
The following is the next scene when Cobb magically appears in the elevator to save Ariadne from being stabbed by Mal.
How did he get to the basement from the upper floor? There weren't any stairways. Is this a goof up or does it mean something?