Eggs hath no fury

Nabe Nabe Entertainment and Pony

Reference to Watanabe Entertainment, a major entertainment agency in Japan. The most famous comedian group under Watanabe's management will be the comedic trio Neptune, and the above panels reference them indirectly as well.

Another talent management agency mentioned is Pony, which is a reference to Sony Music Artists Inc (SMA). Yes, they manage comedians as well lol. Agencies have distinct styles of management, which eventually shows in the type of comedians they manage. Kenjaku assumes that Takaba is with Pony because SMA has managed to propel an impressive number of solo comedians to fame despite the comparatively smaller scale of management. They also lean more slapstick than the "cooler" forms like skits and monologues. In fact, Takaba reminds me of Koume Dayū:

Laughing Dog? Vocabula?

Both Laughing Dog (Warau Inu) and Vocabula (Vocabula Tengoku) were incredibly popular variety TV serial programmes that Neptune appeared in during the 1990s and early 2000s. Takaba admires Neptune, which is why he chooses to sign with Nabe Nabe rather than Pony, even if the latter may actually manage him better.

Kenjaku wondered for a second why Takaba didn't cite Vocabula as the reason he admires Neptune, because Vocabula was the one that gave Neptune their shot to fame, and they absolutely reached superstar levels of fame during the time. Laughing Dog came later, when they were already established as household names.

The reason why Kenjaku walked back on it with "I guess that's obvious enough" has to do with the nature of the two programmes. Laughing Dog was a sketch comedy programme like Chappelle's Show, while as the name may suggest, Vocabula focused on wordplays, puns, and parodies. Comedians were voted based on how they performed the jokes. Here's a short clip of Neptune on Vocabula:

While here's a sketch from Laughing Dog (the second, third, and fourth green leaves members are Neptune lol):

Of course Takaba was inspired by Laughing Dog, "I guess that's obvious enough".

Backbone! My backbone!

An actual short gag (ippatsu gag or lit. one-shot gag) by Haranishi from the duo FUJIWARA:

It's not the first time Akutami has referenced an actual short gag in the series. Perhaps you may remember Itadori's unfortunate reunion scene at the sister school goodwill event:

This is a gag from Kojima Yoshio:

You have my condolences, Itadori.

Comedians and auditions

Kenjaku is dressed like a stereotypical TV producer here. This dates back to Japan's asset price bubble; during which, tying a cardigan over the shoulders was a staple look among TV producers and directors. In this scene, Takaba is auditioning like he would for a part in a variety TV show. Struggling comedians like Takaba often audition for variety shows that showcase a series of comedic skits or manzai. Pass the audition and you get a spot to perform on national TV.

Comedians and theatre

Most comedians who don't get their big breaks on TV spend a large part of their careers in small theatres. A typical comedy show consists of several groups of comedians performing their skits or manzai, and the theatre will hand out feedback forms like the above. It seems like Takaba used to go by the stage name Pinchan.

P-1? C-1?

The fictional C-1 is a reference to an actual long-running competition M-1 Grand Prix, while the fictional P-1 which Takaba mentioned earlier is a reference to another competition R-1 Grand Prix. M-1 is restricted to manzai performed by two people or more, while R-1 is open to solo comedians only. There are several important annual comedy competitions in Japan. Winning these big-name competitions is usually the ticket to fame for many comedians, but even then it may not work out for everyone.

Idol shows

It has become customary to have established Japanese comedians host Japanese girl groups TV shows, and I pretty much agree with Takaba's take on why. If you're a fan of idol groups like Morning Musume, AKB48, Nogizaka46, or Idoling!!!, then you would be familiar with Japanese comedians like Ninety-Nine, Ariyoshi Hiroiki, Bananaman, and Bakarhythm.

By the way, Takaba was watching TV while eating cup noodles after the above panel. The lines are from a well-known manzai performed by comedy duo Audrey. This particular joke with them going "hehehe" at each other is a staple in their early manzai:

In fact, take a closer look at the apartment that Takaba lives in. It's based on the actual apartment Kasuga (pink vest guy on the right) used to live in, named Mutsumi-sō. His shabby apartment and extremely thrifty lifestyle had been featured in many variety TV shows in the past. He lived there for more than 20 years, and the apartment was actually quite a tourist spot for fans of Audrey. Kasuga's Japanese Wikipedia article even has a photo of it as seen below, which is what I think Akutami referenced from. The interior is largely based on Kasuga's apartment as well:

Bonus Japanese comedy!

Akutami has taken inspiration from actual Japanese comedians in the past. In chapter 153, two of the spectators look eerily like comedy duo Sandwichman:

And how can we forget Ken, the fellow comedian who gave Takaba advice in chapter 146:

He's based on Kendo Kobayashi, and if you've seen images/clips of Akutami dressed up as Mechamaru, that was when he went on Kenkoba's show:

"Karappo, kairai, garandou"

I really like the connotations of associating Senjumaru, Mayuri, and Kisuke. We already saw hints that Senjumaru and Mayuri knew each other. Who knows if Kubo will ever reveal more.

Shigarami

After the last episode aired, @shiroukage pointed out that Senjumaru said this in her extended fight with Gerard:

I don't know how I missed this out the first time! It does seem likely that her shikai name is Shigarami.

I found the choice of "shigarami" and its assigned kanji rather interesting. The kanji can be read as shigarami, with "shi" (lit. needle) an obvious connection to Senjumaru's title as the Great Weave Guard.

However, the kanji itself is pronounced as shiraku or bloodletting. But it's not simply bloodletting, which will be referred to as shaketsu. Shiraku has its roots in traditional Chinese medicine (that has been adapted and modified in Japan). Instead of focusing on how much blood is let out, the focus is to prick the appropriate points - usually based on the meridians - to achieve specific results with minimal blood loss.

Considering how Kubo based the position of the shinigami's saketsu and hakusui on acupuncture points (refer to Q422 in Klub Outside), I'm inclined to believe he does know of this traditional Chinese medicine practice.

Moreover, we usually understand this reading (with a different kanji of course) as (1) weir or (2) any obligations holding us back or shackles tying us down from doing something. Or worldly attachments, if we want to lean into the Buddhist context.

Weaving but also?

If you pay attention to what Senjumaru says, she starts each line with "___kase" (the blank being the number in order). The kase used in this instance (if the closed captions are accurate) is a specific kanji that is a unit "hank" for coiling threads.

Now, another common understanding of this reading kase (with a different kanji of course) is shackles. You see it? I wouldn't be surprised if Kubo has knowingly paired shigarami and kase while moving away from the common meanings yet still sticking closely to the weaving theme. Beautiful.

One more weaving reference is from "tsuji". We typically think of it as crossroads or junctions, but when it comes to traditional Japanese clothing, tsuji refers to the stitching that comes to form the 十 character.

The first circled part refers to tsuji. Source: https://mamalrescha.com/trivia/tsujitsuma/