Take has thrown some really obscure Baki the Grappler references in special illustrations shared on Twitter; in a particular spoof of a very early Baki manga event where Yujiro is unable to open a door due someone holding the handle on the other sidenote it is a minor meme because Yujiro was eventually touted as the strongest creature in the world, so an early manga event where he can’t open a door looks ridiculous in retrospect; one would need to be really into Baki to even notice these obtuse references.
Uzaki's speech about Chocomint in Episode 5 takes a lot of cues from Gihren Zabi's Sieg Zeon speech, especially with the "Turn your sadness into anger" line.
The owner of Café Asia where the main characters work is referred to as Master, a nod to Master Asia of Mobile Fighter G Gundam. In Episode 6, he references another G Gundam character that shares his voice actor, Stalker, by performing the introductory narration in a similar manner, complete with "Ready... Go!"
At the end of Episode 6, Ami bets Kakyoin's soul that Sakaki will fail at setting up Uzaki and Sakurai.
A Fist of the North Star reference in Episode 7; with Sakurai promising to pay for Uzaki's birthday meal at the pub, she rapidly presses the tablet to make orders while shouting "ATATATATATATA" (even mimicking Tenha no Kamae complete with a glowing aura in the build up), she then points at Sakurai stating "Your wallet is already dead" (Omae no saifu wa mō shin deru). After doing it a second time, they are scolded by a server.
At the end of Episode 9 and throughout Episode 10 have Uzaki and Sakurai visit Tottori Prefecture, and various real life landmarks are shown such as the Tottori Sand Dunes. Being the home of their creators, there are plentiful shout outs to the following manga:
Case Closed: The first place Uzaki and Sakurai visit is Tottori Sand Dunes Conan Airport. At one point Uzaki wears glasses making her look like Conan. Ami and Sakaki, who follow the duo, are drawn dark and blank much like the series' suspects, complete with appropriate background music in the anime.
Goro Akechi makes an appearance as an nendoroid on display.
In Episode 11, during the first few moments before the opening, Uzaki knocks on the door to the Terminator tempo.
Chapter 11 shows a four-armed creature based on the Chief in Bijin Onna Joushi Takizawa-san, which is another manga published by Kadokawa Shoten's Fujimi Shobo.
Video Game references:
Take likes to give some pretty clear background on Uzaki and Sakurai's gaming sessions.
In Episode 3, Uzaki vents her frustration during a gaming session where she is having a hard time during a boss fight against a certain bald man, who becomes more aggressive with his scissors once his shield gets destroyed; that boss is Sundowner from the crazy action packed Metal Gear Rising: Revengeance.
Uzaki and Sakurai in the manga have some fun playing a certain PS2 title, Uzaki notes on how the enemy can throw his Mohawk as an attack, and the sound bite note coming from their TV is "Sensei, Onegaishimasu"; that game is God Hand, with its outlandish enemies and Gene’s infamous groveling "attack".
Take is up to date on his video game knowledge, as Chapter 54 of the manga has Yanagi and Uzaki playing an obvious Lawyer-Friendly Cameo of Fall Guys, the game was barely a month old in the market at the time of the chapter’s publishing, merely weeks of being confirmed as a very successful online multiplayer sensation.
Season 2 Episode 3 has Uzaki refers to a game called "Tora ga GOD Kuu", which refers to the Like a Dragon (Ryu ga Gotoku) franchise. Said game features two characters resembling Jin Kuwana and Takayuki Yagami on the cover. There's even an Imagine Spot which reenacts a random encounter in the franchise, complete with cheering bystanders and the trademark gate of Kamurocho (or its real-life counterpart Kabukicho).
where Yujiro is unable to open a door due someone holding the handle on the other sidenote ; one would need to be really into Baki to even notice these obtuse references.