I examined the screen and its frame very closely from all sides, but I really cannot seem to find any form of damage whatsoever. I did notice that I can elicit the ghost inputs by very gently pressing, rather than merely touching, the screen on the strip where the ghost inputs would pop up. After that, the ghost taps may go on for a while without me touching it.
So somehow it seems as if internally, some connections are made that should not be made upon applying a minimum amount of force - the amount of force I would also apply when simply taking the device out of my pocket.