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.
YMMV: What About Bob?
Alternate Character Interpretation: The story could easily be seen as Bob the Jerkass tormenting the stressed-out Dr. Marvin while everyone is too stupid to realize Bob is actually not as wonderful as they say he is. On the other hand, Dr. Marvin has legitimately pissed off a lot of people and screwed up his own family well before Bob ever showed up, and Bob is clearly a pretty nice and well-meaning guy underneath his mental issues.
Fridge Brilliance: You may wonder why Leo doesn't just call the cops on Bob or file a lawsuit against him - until you realize that Leo is so concerned about not looking like the bad guy to his family, who already have significant problems with him and are conversely enjoying Bob's company, that he's effectively prevented from doing anything like that.
Jerkass Woobie: Dr. Marvin may be an obnoxious Jerkass, but one can't help but feel sorry for him considering everything he suffers at Bob's hands over the course of the story.
Magnificent Bastard: Whether or not the Alternate Character Interpretation applies, you have to admit that the way Bob figured out the location of Leo's vacation home is pretty damn clever. Bob fakes his own death and goes to the phone company posing as a detective investigating the matter, where he convinces the operator to tell him Leo's address by claiming that he would need it for postage. Heck, if Alternate Character Interpretationdoes apply, he's even more of a Magnificent Bastard since, according to said interpretation, he played the entire cast of the film like a fiddle.
Throw It In: The scene with Bob entertaining the nursing staff at the mental institution was unscripted — Bill Murray was just having fun.
Unfortunate Implications: While Leo certainly is a Jerkass, Bob's actions, innocently intended or not, would generally be considered, at minimum, a gross violation of the patient-professional relationship, and probably criminal harassment, invasion of privacy, and/or stalking. This makes the rather sympathetic portrayal...problematic.
The Woobie: Bob. Honestly, he doesn't necessarily mean to drive other people crazy because of his craziness. And you have to wonder what happened to the poor guy to make him so unbalanced and phobic in the first place.