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.
Base Breaker: Though she only got to appear once, Jessie Bradshaw in the '80s series wasn't very liked by classic Quest fans for feeling like a shoehorned-in love interest for Jonny. Those who liked the character wished that she could appear more, although Jessie Bannon would more or less wind up filling the original Jessie's part.
Ear Worm: That big band theme is as catchy today as it was in 1964.
Ensemble Darkhorse: Jade, who only appears in two episodes, became very popular precisely because of how little we knew about her. She also offers a tantalizing glimpse at Race's past.
Ethnic Scrappy: Charlie, the Chinese cook in "The Sea Haunt", comes uncomfortably close.
Fair for Its Day: Nearly all the characters from more "exotic" countries - including villains - are little more than ethnic stereotypes of varying degrees. This includes one of the main characters, Hadji. This leads to Unfortunate Implications in the case of some of the Asian villains, who clearly show shades of Yellow Peril in their characterization.