I consider this film a classic of B-movie sci-fi. It has mechanically intricate devices, rather implausible elements (gravitational field reverses, for one), and in this case, some rather poor footage. There was a scene in which one crew member relized he was being left behind, and the poor lighting had so much glare or such poor lighting (cannot remember which) on his space helmet's visor, that only his teeth were visible (he was black). Dispite the seriousness of that scene, I could not help laughing. I think those helmets had illuminated interiors, so faces would be visible, but even if so, this poor cinematography slipped past the production crew.
Another of my favorites is
Voyage to a prehistoric planet. When I was a kid, this was
the best Sci-fi film I could imagine. It had a rather sketchy plot, but as a kid, I cared more about the robot & the hover-car, than the plot. The robot was so mechanically intricate, that Robby the Robot seemed lame by comparision. John (the robot) had a really cool synthesized (sounding) voice, was both large and powerful, & even had articulated toes. If I remember correctly, oscilloscopes were over-used as technical-looking items on the ship's instrument panels, most every surface was silver or aluminum colored, & there were plenty of moving objects to add 'realism'. Compared to
Forbidden planet, I would say that a similar comparision would be between Space 1999 & Star Trek.
Star Trek_____Forbidden planet
------------ == -----------------------
Sp 1999______Voyage to a prehistoric planet
While those atop (numerators) focused on quality plots, & other script elements, & had most technical items represented by smooth surfaces & blinking lights, those on bottom (denominators) focused on technical intricacy & had rather poor plots. It seems obvious that in the Trek films, the smooth-skinned spacecraft of the 60s gave way to the more detailed exteriors that were featured in Star Wars. BTW, I saw the Melleniun Falcon @ the Smithsonian Air & space a few years age, & upon looking closely, noted engine decks from 1/35th scale Tamiya Panther tank models all over it. Too bad I did not have a camera.

It was little more than grilles and cooling fans.
