
Continuity mistake: After Dory reads the wall map while she's in the glass carafe, when Hank hides behind the rolling cabinet there's a long shot of the corridor with him at the far wall, then in the next shot from behind Hank a drinking fountain has suddenly appeared on the wall to the left, between two pictures.
Chosen answer: In the absence of a neuropsychological work-up, we have only Dory's word for it: "I have short term memory loss...It runs in my family...at least, I think it does." So, Dory believes it to be genetic. At least, I think she does.
Michael Albert