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: Lost in Space
From the show
Cool Car: The "Chariot" space buggy is indisputably nifty.
Narm: Hoo boy. Probably most notable is the episode "The Great Vegetable Rebellion," where Mark Goddard has noted that during several shots you can see him deliberately not looking at the vegetable people so he wouldn't laugh.
Or better yet, ignore the movie and just buy the soundtrack (the Intrada score CD, not the song album - while the latter does have 30 minutes of Broughton, you have to sit through an awful lot of techno [in both senses of the term] to get to it. And most of the songs are only heard over the end credits anyway! Plus Broughton's stuff is all on the lengthy score CD under other names).
What an Idiot: In the movie, John discovered Future-Will had built a working time machine with enough power for a single one-way trip. When he sees his ship along with his family perish in a meteor shower in the atmosphere of the planet, he decides to use the time machine to travel back a few minutes and prevent their deaths. Sounds all well and good, if you don't take into consideration he could've just gone back to the day of the shuttle launch that sent him and his family spiralling through time and space to unknown reaches of the galaxy and prevent the entire plot of the movie.
Actually this is explained in the film itself. The gravity and temporal anomalies generated by the device are literally ripping the planet apart, so connecting the time-machine to anywhere near Earth would not be a good thing!