If people condition themselves to going to a certain platform I can imagine them not seeing a train if it is the subject to a platform alteration. Even I have done this sort of thing - automatically go to platform 1 to catch a train to London, stressing because I have assumed that the train must have been cancelled because it does not appear on the screen on the platform, and then feeling stupid on looking on the main departure board and seeing that it will be leaving from platform 3, as it always does.