Episode 19 features a scene where Sanageyama faces flying enemies with a damaged Goku uniform, pleading for it to "hold on just a bit longer", very similar to when Viral faced flying enemies with his damaged Gunmen. Additionally, the two scenes feature an identical shot from above.
Anime First: The series was originally going to be a manga with straight-up action and little else. Now it's a more character-focused anime (though there's still plenty of ass-kicking, and a manga adaptation to go with it).
Blooper: In Episode 16 Ryuko is seen reverse sitting on a chair, her legs through the holes under the arm-supports. Then she violently stands up, grabbing said chair and lifting it above her head. However, there is no scene of her pulling her legs out from under the arm supports. It's pretty much like they phased through her legs when she was standing up. Can be seen here and here.
Completely Different Title: The show's Chinese name, which translates to both The Girl Who Cuts Cloth and The Girl Who Cuts By Dual Wielding.
In the original drafts of the script, the show's title was "The Crimson Garment"
The designs and, to an extent, the personalities of the main protagonist and antagonist are reminiscent of Tengen Toppa Gurren Lagann characters Simon and Rossiu, respectively. The entire show could even be considered as TTGL's Distaff Counterpart.
Gamagoori is more or less a teenage, subservient Raoh (with a character design closer to Souther, though) and a reincarnated Hentai Kamen.
Tsumugu is Yoko genderbent. He's got a shock of red hair and excellent sniper skills, and he's extremely attractive, especially in his revealing battle uniform. Yoko could also be his mother, with Kittan as his father.
Senketsu and Isshin Matoi seem like expies of Mazinger Z and Dr. Juzo Kabuto. Isshin created a super powerful uniform then was killed by the antagonist which propelled Ryuko into her Roaring Rampage of Revenge. She also uses her father's creation to exact her revenge similarly to Kouji Kabuto.
Ryuko's situation is also similar to that of another Go Nagai creation, Cutey Honey. Honey, like Ryuko, is also out for revenge after her father was killed. Said father was also responsible in some way for her powers. Both also wear highly Stripperiffic outfits in battle.
Ryuko's situation and personality also bares a striking resemblance to that of Ragna The Bloodedge. Both of them are mean, but good-natured loners who wield really large swords that can transform into an even bigger sword. They're primarily motivated by revenge for the death of a loved one and go against an established government to do so, and end in up a conflict with a Katana user Who later is revealed to be their sibling. Bonus points for the actual culprits of their messed up lives being revealed later, and taunt them over their weakness which massively pisses them off. The Big Bad of each respective series is also revealed to be a relative of theirs as well, who is also under the control of an otherworldly menace.note The main difference here is, unlike what happened so far in Blaz Blue Chrono PhantasmaBoth Ragyo and Nui worked and died together at the end compared with what happened with Terumi (Nui's counterpart), who was betrayed by Izanami (Ragyo's counterpart) and killed by Hakumen at the end.
Character design-wise, Ryuko looks a helluva lot like Seija Kijin, enough for many Japanese fan-artists to create lots of crossover art featuring both Ryuko and Seija switching clothes and/or situations. In less degree, many artists love to depict Mako as Shinmyomaru Sukuna, also from Double Dealing Character.note It does help both Double Dealing Character and this series debuted in the same year, with few months of difference.
Maiko Ogure looks like she could be the sibling of Rue from Princess Tutu.
Houka Inumuta is like a more cynical version of Miki Kaoru.
If Ryuko is Simon and Satsuki is Rossiu then Mako is the Kamina of the three. There are many similarities, both are rather crazy, have weird perception of the world, has no real power when compared to the protagonist, are utterly fearless and will charge into any situation without much thinking. What is the most important however is that both serve as enormous moral support to the protagonist in their moments of need.
The Original Life Fiber is basically Lavos right down to its entire modus operandi, which it takes above and beyond Lavos simply by virtue of intending to blow up the entire planet.
For bonus points, Ragyo Kiryuin assumes a role very similiar to Queen Zeal.
Some fans point out the similarities to s-CRY-ed. Both are conflicts between a chaotic Anti-Hero and an Anti-Villain working for the established order, who end up working together when a larger threat comes around. Kazuma and Ryuhou even have similar personalities and a similar dynamic between them to Ryuko and Satsuki.
Many people saw Satsuki's betrayal of her mother coming, based mostly on her characterization, which showed that she cared for her subordinates, and even Ryuko. It also helped that the series has several references to the Sengoku Period, and that Honnouji is the place where Oda Nobunaga was betrayed by Akechi Mitsuhide.
Many people had called that Satsuki was training Ryuko.
At the same time, many people called the twist from episode 18 regarding Ryuko and Satsuki being sisters.
Some people managed to figure out that Soichiro Kiryuin and Professor Matoi are the same person, after Ragyo revealed that Ryuko is her daughter.
The purpose of a Kamui's Stripperiffic-ness was very easy to guess (to avoid overwhelming the wearer). The lack of purpose for the high heels made it hard to be 100% sure, though.
The Reveal: After the whole season being listed as "?" in the credits, the voice actor for the dog, Guts has tweeted himself out two days after the finale aired.
Katsuyuki Konishi: "...Let me give you two pieces of information. One, our DVDs and Blue-Rays are selling like hotcakes; Two, I'm Guts, GATTSU-GATTSUU~!!" note The creators mentioned at the episode 24 screening that the "?" credit was initially because, with Konishi being a big-name voice actor, they didn't want fans to guess that they wouldn't hire him just to play a Poke-Speaking dog and guessing that he was going to voice another character (the as-yet-unrevealed Tsumugu, who didn't appear until episode 5).
Episode 15 ends with yet another victory for Satsuki, along with the promise of a much-needed Info Dump in the next episode. Episode 16 opens with Senketsu stating that it's time for a Recap Episode! Just before the audience can get too angry, it becomes apparent that the recap will be a Motor Mouthed crash course that doesn't take a full minute. The episode proceeds as it should from there.
Senketsu: Those of you whose hearts sank at the words, "compilation episode", rest easy! Kill la Kill is known for its lightning pace! Even our compilations are wrapped up in the teaser!
Fans have been predicting Mako's death since the series began; episode 21 just takes this and runs with it by putting her into so many near-death experiences. Unsurprisingly, she survives the episode.
Episode 22 follows suit... and she still survives.
Symbolism: this is a good run-down of much of the mythological symbolism used in the series.