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.
And the unworldly-sounding sitar score for "The Troubled Spirit".
Ensemble Darkhorse: Alan Carter was originally planned to be written out as part of the cast changes for Season Two. However, when the producers learned how popular he was with viewers, he was kept on and given an expanded role.
To a degree, Fraser in Series 2.
Fridge Horror: With every death of any of the irreplaceable 311 people on Moonbase Alpha, even Red Shirt characters, and to a lesser extent the loss of equipment, the bleaker the isolated crew's chances of survival become through the series even as they helplessly drift out of control through space.
Gets even worse when you think of episodes like "The Exiles", where a key plot element involves the fact that the Alpha life support system cannot support the 300 or so people on the base by that time. As a result, they are not only unable to take in the Galosian exile criminals, but they are also unable to permit any more births on the base.
Idiot Plot: the second season, especially - so much so that even series star, Martin Landau, complained.
At the time, it was the most expensive TV series ever made and the effects still stand up today, so this is probably an indication that critics didn't check their facts.
The spaceship fx are extremely high quality, and usually achieved using double-exposure rather than blue screen. This means the images are captured on the original negative and don't suffer from extra grain, although this does limit the angles that can be used. On the other hand the show does have some extremely poor matte paintings.