* BigLippedAlligatorMoment: Quite a few, but especially the "Uh-oh" sequence.
* BizarroEpisode: Strangely has nothing to do with the episode titled "Bizarro." One episode may count for being the only non-comedic episode in the series. It was redubbed by the 2021 actors, but using the 2020 script, just to show how boring the old show was.
* CrossesTheLineTwice: They're good at this.
-->'''Sparks:''' Go roll over for the Nazis!
-->'''Yost:''' For your information, the Dutch Resistance was a crucial factor in the Allied victory in WorldWarII.
-->'''Sparks:''' Oh yeah? Why don't you go tell that to [[TheDiaryOfAYoungGirl Anne Frank]]?
* EnsembleDarkhorse: Captain Murphy. There's a reason that many people consider the episodes after he was written out of the show to be inferior.
* EarWorm: The theme song is surprisingly lyrical and catchy as all hell.
* FridgeHorror: TheOtherWiki lists the ranks of the main characters where known. Guess who had the highest command after Murphy/Shanks (and presumably had control of Sealab when they're between captains)? ''Sparks.'' (He's a commander, the others are either lieutenant commander or lieutenant.) Granted, he's one of the non-stupid characters. He's just also insane and evil.
* HilariousInHindsight:
** Murphy established the [[Music/KnightsOfCydonia Knights of Mars]] before they were cool.
** The "Black Stormy" question from "Chickmate" becomes this when we find out the crew of Spacelab are opposite race versions of the Sealab crew. So yes, there ''is'' a Black Stormy.
* IdiotPlot: Since nearly all the characters are indeed idiots, a JustifiedTrope.
* JumpedTheShark: Generally accepted to be when Harry Goz died.
** Lampshaded when, in one episode, Sharko is seen jumping his motorcycle over a large tank filled with [[HappyDays Fonzies.]]
* PositiveDiscrimination: Frequently played with with Debbie Dupree (only main female character) and Dr. Quinn (only main African-American character); the show will set them up for this trope, then suddenly have them grab the IdiotBall or show Jerkass tendencies in order to lampshade the trope. Usually happens to minor recurring character Debbie Love as well.
* TheScrappy: Sharko is an in-universe example, where he's regularly mocked and ridiculed. It reached its peak when he appeared on the "Anime Talk Show" special, where most of the special was taken up by everyone (but mostly Space Ghost) talking about how much of a disgusting freak of nature he is before he was finally gutted by [[{{Squidbillies}} Early.]]
** Many fans view Tornado Shanks as a ReplacementScrappy.
* UglyCute: Bizarro Quinn, and Murphy's scorpion Ben.
* WeirdAlEffect: Really, if it weren't for this show, no one would even know there ''was'' a ''Sealab 2020''.
* TheWoobie: Even though it's almost always PlayedForLaughs, it's hard not to feel bad for Quinn.
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