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.
YMMV: Galaxy Quest
Alternate Character Interpretation: Mathesar at the end. When he says Jason's explanation of the show was "a very clever deception indeed," does he now accept the truth, or does he think it was something Jason made up to trick Sarris?
Awesome Music: The soundtrack is very good, particularly as it emulates many of the Star Trek themes.
Complete Monster: The galactic warlord Sarris launches a campaign of genocide against the na´ve and child-like Thermian race in order to get a powerful and mysterious device the Thermians have, the Omega 13, not knowing that the Omega 13, as well as the entire Thermian culture, is based on an old television show called "Galaxy Quest," and that the Thermians have recruited the actors from the show to save them. In order to get the Omega 13, Sarris tortured the former Thermian commander for days, only killing him when he "grew tired of the noises" the old commander made. In his pursuit of the device, Sarris wiped out the entire Thermian race save for a crew of hundreds, tortured Thermian leader Mathesar in front of lead actor, Jason Nesmith, and prepares to torture Nesmith's Love Interest, Gwen, when Jason can't answer what the device does. Finding out the truth, Sarris forces Nesmith to tell Mathesar about the show in order to crush Mathesar completely, tries to have the actors thrown out the airlock, and tries to murder the last remnant of the Thermian race by slowly suffocating them to death precisely. Sarris also shows no empathy for the lives of those under his command, he decapitated his lieutenant for failing to get the ship's shields up in time and carried his head around on a spike, and doesn't care that his men on the Thermian ship will be killed in the upcoming core implosion so long as they kill the actors for him. His ship destroyed, Sarris disguises himself as a crewmember and teleports onto their ship, where he personally kills actor and Thermian alike, only failing due to the Omega 13 allowing for time travel. Throughout the movie, Sarris manages to be an utterly horrifying villain despite being in an otherwise funny movie.
After Tommy is injured badly, he has to be carried out to the medical bay in a bit Played for Laughs. Daryl Mitchell, the actor playing Tommy, was in a motorcycle accident and was left paralyzed because of it. Now watch the scene with this fact in mind...
A running gag is Guy's worry about getting killed off. In Moon, his actor, Sam Rockwell, plays a character whose point is to get routinely cloned and killed off over and over.
Genius Bonus: One of the Thermians mentions their people being forced to produce gallium arsenide. It sounds like Technobabble, but it's a real chemical, used in the production of integrated circuits and laser diodes.
Similarly, the same character's rather out-of-nowhere remark on how impressively clean the floors are in the alien spaceship.
Also, Shepherd is fighting Gorignak (the rock monster), and remarks that he "doesn't have any weak points." The line becomes especially ironic when Gorignak later makes a kind-of reappearance in Metroid Prime, where its revealed that it does have a weakness (using the thermal visor to locate the weak phazon ore, expose it with firepower, and then finishing it off with firepower while using the combat visor.
Sarris also has an impressively creepy design for a parody film, especially thanks to the articulated tentacle-hair pieces.
A few Ugly Cute mook creatures ripping one of their ranks to shreds, which is almost immediately followed by a native beast being the victim of a teleportation gone horribly wrong, turning inside out and then ''exploding''.
Uncanny Valley: The somewhat unnatural way the Thermians act when they have their "human appearance" generators activated. This might be owing to the fact that they are not really a Human Alien species... or that their reference on how to act human came from fictional TV shows. Or a combination of the two, really.