At the very beginning Aidan says it is day 42 and he is sorry cause he tried. later in the movie when it is officially day 42 he only says sorry.
In one scene you see that the room he is in is 4325 and they when he leaves the rock climber's room that room has turned into 4325 and his is somehow now 4327.
If Lucy stepped off the bed to which she is tethered, she could reach Aidan on the floor.