Sadly, three errors undermine the reality of this film which otherwise had great pathos.The first glaring error was when the opthalmologist became frustrated with Bardem who understandably because of his condition/illness could not understand or take instruction as a normal person, the error being that his daughter clearly did not explain before the exam that her father had dementia as shown by the opthalmologist asking her if her father was 'all there'. How could a caring person (the daughter) not warn anyone dealing with a parent with dementia be so unthinking as to not do this?
The second error is a repeat of this, when in the clothes warehouse the security guard tackles Bardem to the floor and all the daughter can say is 'my father is confused'. That doesn't help her father or those dealing with his unusual behaviour--anyone with a bit of sense would make it abundantly clear that Bardem was suffering from dementia, so that others would then treat him more sensitively.
The third error concerns the daughter repeatedly excusing herself from an important meeting at her work which involved an important project she had undertaken. It seems that because she didn't make it into work that day, someone else or their work was chosen above her(s). At no point does she explain the truth about why she couldn't get into work ie that she was having to deal with her very ill father; instead she gave mumbled, ineffectual excuses which most likely sounded very lame to her boss or whoever was calling her from her work. Why the hell wouldn't she convey the gravity of her situation when she might then get some understanding and sympathy from her workplace?
These are clearly errors in the script, odd that neither the director nor anyone else picked up on them. For em there were jarring, unrealistic moments in the film which accordingly undermined its plausibility.