These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Nightmare Fuel: The close-ups of the Whistler's Mother's face as Bean progressively ruins it, combined with the apocalyptic background theme, are quite scary.
What an Idiot: David's actions after discovering that Bean destroyed Whistler's Mother, which is to try and cover it up for him. This wouldn't even work in the first place, since the painting is going to be unveiled in a few days anyway, and as far as he can tell he can't just miraculously restore the painting to its prior state before then. David even addresses why he shouldn't just report it to his bosses and colleagues what Bean did, but then draws the wrong conclusion, stating that it's on him since he accepted responsibility for Bean's actions and even left him alone with the painting while knowing that Bean has a penchant for destruction, and would thus be sued for neglicence in the destruction of a national treasure worth fifty million dollars. There are some counterpoints to this:
Actually, it was David's superior who ordered Bean to stay in the room by himself. He justifies it by saying that it would give Bean some inspiration for his speech, but he also already knew by that point how strange Bean was and that he ruined the dinner evening immediately before with his crazy antics, so he almost certainly did it so he wouldn't have to be around Bean. This means that the responsibility for leaving the inept Bean alone with the painting was his, not David's — David just reiterated with his boss already ordered.
David could also not reasonably accept responsiblity for Bean's behavior and actions. It was never *his* idea for Bean to come over to Los Angelas in the first place: David was intentionally misled by the false recommendations of the British Royal Gallery's board members into thinking that Bean was a genius, making him not responsible for that as well.
Basically, whatever consequences would come to his career of reporting the vandalism to his superiors, not doing so would be much worse, since it actually made David complicit in the crime by trying to cover it up. And there is video evidence for all of it.