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.
"Funny Aneurysm" Moment: There is a line in the book that references Ford Prefect puffing and panting after running a short distance, followed by the joke that "Writers are not used to that kind of exercise". Douglas Adams, the series' progenitor, died of a heart attack he sustained while working out.
Trillian, who came across as a very poor mother in Mostly Harmless, thanks to her Married to the Job lifestyle, is much more sympathetic here and spends a lot of the book dealing with her guilt over how she raised Random.
Random herself, thanks to her Lotus-Eater Machine experience of serving as Galactic President, transcends her original Emo Teen characterization and now has ambitions of opening Earth up to contact with the rest of the galaxy.