Bizarro Episode: The aforementioned Task 39, coupled with Clip Shows of past episodes (first as they try to figure out which villain sent them the Prometheus Stone, then when its bomb is accidentally activated and everyone decides to stay together when it goes off). As it turns out, it was Makino-sensei who gave them the Stone as a form of training, and they stopped the bomb in the nick of time by smothering the Stone in Aegean salt. That is, no henshin, no mecha fights, and Eiji and Masumi dancing hula among other things.
Broken Base: The suits. Are they the most awesome thing ever, or way too cluttered and ugly?
Costume Porn: The suits are among the most high-tech and flashy in Sentai's 40-year run.
Family-Unfriendly Aesop: For Eiji: He's mixed-race (Human/Ashu), but that's okay, as long as he actively fights his racially undesirable side! This Aesop is especially strange since it was shown that his mother was kind-hearted which means Always Chaotic Evil should be averted, but alas...
On the other hand, he has justified reason for so as his racially undesirable side is that of a destruction-loving literal monster. It could count as a Fantastic Aesop, because you can not be a Half-Human Hybrid in real life.
Fridge Brilliance: Natsuki/Bouken Yellow being a Lemurian Princess would look normal, unless you realize that back then in Dai Sentai Goggle Five, Lemuria is the civilization symbolized by Goggle Yellow.
Hilarious in Hindsight: Unless their numbers are being multiplied by special effects, you only seem to see a maximum of three Jaryuu on the screen at once, much like Land of the Lost, where you only saw three Sleestacks on camera at once because that's how many costumes they could afford.
Irony: Despite being one of the most loved Sentai series, it's American counterpart Power Rangers Operation Overdrive is considered by some people to be the worst season in the entire franchise.
Les Yay: The sequence where Natsumi imagined she was Cinderella and Sakura was Prince Charming.
Magnificent Bastard: The Questers. When you can not only manipulate the three main evil factions to provide the materials for the ultimate lifeform, but also unleash a long-lost cousin to keep the Boukengers further occupied, you're pretty magnificent in your bastardry.
Memetic Mutation: Let's just say Masumi is better remembered by his crooked teeth than by his actions.