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.
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.
Dull Surprise: John Robinson, notoriously. Unfortunately he has the most screentime. In fact, the rest of the crew qualify too, apart from perhaps Major West, and certainly Penny and Dr. Smith.