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.
Special Effect Failure: Arguably some of the worst effects in a 1970s SF series. This was caused partially by an innovative motion-tracking Green Screen system invented by Douglas Trumbull for the show which failed to actually work at all, and partially by an effects budget which probably couldn't have bought a week's groceries for a 4-person family.
From inside, the curvature of the biodome roofs is clearly visible. The exterior shots of the ship indicate that the domes must be at least hundreds of miles across, far too large for the curvature of the domes to be so clearly visible. In fact, all interior shots of the domes make it look like they're much less than ten miles across.