- Accidental Innuendo: One of the cooks wears an apron with an extremely phallic-looking squid and droplets of water that look like they're shooting out of its.... err, tip.
- Alternate Character Interpretation: Is Mike as cheerful and carefree as the series portrays, or is this all a front to keep her crew's morale since she fully understands the dire circumstances that the Harekaze is currently in?
- Broken Base:
- The lack of heavier-than-air flight in-universe (even though lighter-than-air flight, landing decks, and accurately-depicted pure anti-air guns exist). Some say it's a poor excuse to not have carriers (which would have made the search for the Harekaze very VERY short), others argue that the writing staff simply didn't consider the massive ramifications it has on how World War II was fought, as the latter was ALSO revealed to have still happened in-universe, especially since superior air power was a tipping point in many of the battles that occurred (see the Battle of Britain, everything that led the way to the Normandy Landings...).
- The reveal in episode 4 that all those ships going rogue might have been caused by an unknown species of hamster sneaking aboard the ships and spreading a Hate Plague that makes crew aggressive and not willing to listen to reason.
- Ensemble Dark Horse: Wilhelmina seems to be quite popular, as a foreign character who manages not to be a walking stereotype. In addition, she also appeals herself to many of the naval buffs tuning into the show by displaying a good grasp of tactics, which many of the crew of the Harekaze ...really don't.
- Friendly Fandoms: With Kantai Collection and Girls und Panzer, due to the obvious similarities and parallels. Kantai Collection due to the focus on WWII ships and naval battles, and Girls Und Panzer due to the premise of high school girls crewing WWII vehicles. Also with World of Warships players due to the anime portrayal of a destroyer as the main cast's vessel is almost similar to what players experienced playing as destroyers in the game. This link only intensified when Harukaze and Graf Spee in their HaiFuri colors and captains became available in game.
- Les Yay:
- The companion manga is full of this. Hiromi Kuroki enrolls at Yokosuka after she meets Mashiro at a Blue Mermaid PR event, and her Childhood Friend Maron only follows her because she wants to keep an eye on Hiromi.
- In-series, Kuroki seems to constantly worry about Mashiro, something Maron clearly disapproves about.
- Mimi Toumatsu, the chief accountant of the Harekaze, is attracted to ship lookout Machiko Noma, as she thinks that the latter is "cool".
- And let's not get into the touchy-feely nature of Childhood Friends Mike and Moka's relationship. When they finally get to see each other again at the end, it almost feels more like a reunion between separated lovers than friends.
- Narm: It gets difficult to feel sad about the sinking of the Harekaze when you realize that she sank in harbor and theoretically could be raised again at any time!
- Narm Charm: Most of the charisma of this show is based on how cute 15-year-old girls behave like severe professional sailors. This effect is achieved even more strongly in foreign translations (especially strongly in english, russian and dutch), when girls begin to use the naval slang.
- Memetic Mutation:
- Fans have joked that the series should instead be called The Hunt for Harekaze, due to the plot similarities to The Hunt for Red October, where a rogue ship is being hunted down by the world's navies. This isn't a coincidence, as the writers admitted that they drew influence from the film.
- With the revelation in episode 4 that the cause of all those ships going rogue might be because of an unknown species of hamster spreading a Hate Plague, some people have been comparing it instead to Freelancer, which features, among other things, an independent ship getting targeted by previously friendly factions with little reason because it turns out they were mind-controlled by aliens.
- The Steering's rap of the 10th episode is very popular on YouTube due to its catchiness and incredible narmy.
- Special Effect Failure: An aerial shot of the ship in episode 9 shows some bad texturing on its deck. The "diamond plate" sheet metal pattern is comically oversized, which each bump about the size of a person.
- What an Idiot!:
- The suggestion to use the Harekaze's active sonar to try and communicate to the I-201 via Morse Code. To submariners, it's usually a sign that an opposing vessel is ready to attack them. In addition, Mike decides to go ahead with the idea even when the rest of the bridge crew tells her this.
- Arguably, the Idiot Ball goes to the sub's captain afterwards after the understandable confusion, for relentlessly pressing the attack against a ship that plainly was NOT attacking them.
- The ship itself not "going dark" during its encounter with the submarine. As Wilhelmina points out, they might as well have been advertising "please, shoot us!" to the opposing sub crew.
YMMV / High School Fleet