Alternate Character Interpretation: Did the tiger suddenly attack Altaira because she felt sexual desire, or had it in fact been sent after the captain to assassinate him, and she simply got in the way?
Prop Recycling: After his debut here, Robby appeared in other films and many TV shows. As did the C57D, primarily on The Twilight Zone (1959). However, from the late 1960s onward Robby's appearances were usually made by replicas, which weren't as heavy as the original. The uniforms and some of Atlaira's clothing used in this movie also appeared in Queen of Outer Space two years later.
It's also claimed that parts of Munchkinland were recycled into Altaira's garden. They were filmed in the same studio, though 20 years apart.
The opening narration is actually fairly pessimistic about space exploration; it states mankind would not reach the Moon until the 2090s (over a century later than we actually did), and that reaching the rest of the solar system would be completed by the end of the 22nd century (we're still waiting on that one, but a lot of older sci-fi assumes we'll get there faster than that).
"Seinfeld" Is Unfunny: This was the science fiction film to watch until the release of 2001: A Space Odyssey and A New Hope, and it reached this standard by having production values, story and scale greater than any film of the genre before it. It was stated by Gene Roddenberry to be one of his main inspirations behind Star Trek: The Original Series and is responsible for creating and/or popularizing most of the sci-fi tropes that we know and love. Today however it is most likely known as that film that looks like Star Trek, has a funny robot and features Leslie Nielsen before he was funny.
Values Dissonance: The film has a very 1950s view of gender politics, most notably in Adams blaming Altaira for all his men lusting after her just for standing around in a miniskirt. He almost goes as far as to outright say that it would have served her well if she had been sexually assaulted by Jerry.
The Id monster, the one time it becomes fully visible, remains unforgettable to this day. That it was animated makes the Eldritch Abomination juggernaut not one jot less terrifying.
Try watching this film on a plasma, the backdrops are amazing!
Walt Disney lent MGM one of his top effects animators, Joshua Meador, to help with the effects. Meador's handling of the various laser beams, energy sparks, and the aforementioned Id Monster has a delicate beauty all its own.