History Fridge / OsomatsuSan

* In the first Cavematsu sketch, the brothers all try to create, er...''[[ADateWithRosiePalms gratification]]'' devices, ranging from simple hollowed-out sticks to far more advanced and anachronistic technology. Is it any wonder that the largest and most mechanically-complex device was created by the cave version of [[NeverLiveItDown Fappymatsu]]?

* Season 3 Episode 18 has Nyaa Hashimoto [[spoiler:falling in love with Osomatsu]], amid the disapproval of everybody else [[spoiler:including Osomatsu's own family]], and her (eventual) full knowledge that [[spoiler:Osomatsu is a piece of crap]]. This, ironically, [[ItMakesSenseInContext is reasonable]] with the knowledge that she's now [[spoiler:a StrugglingSingleMother]]. This is in fact a two-fold fridge horror:
** Her HorribleJudgeOfCharacter possibly caused her to marry someone [[spoiler:who later divorces her and abandons their baby]].
** Her status means she's prone to admiration of someone handing her a KindnessBall, as in the case of [[spoiler:Osomatsu]].

* Season 3 Episode 18 has Nyaa Hashimoto [[spoiler:falling in love with Osomatsu just because he saved her child out of kindness]], amid the disapproval of everybody else [[spoiler:including Osomatsu's own family]], and her full knowledge that [[spoiler:Osomatsu is a piece of crap]]. This, ironically, becomes reasonable when one knows that she's now [[spoiler:a single mother, divorced with a husband she had married before knowing well]]. She probably had, and still has, [[HorribleJudgeOfCharacter poor judgement of a man's character]]. In some sense it's [[StatusQuoIsGod the nature of this series]] which saves her from further misery.

* Season 3 Episode 18 has Nyaa Hashimoto [[spoiler:falling in love with Osomatsu just because he saved her child out of kindness]], amid the disapproval of everybody else [[spoiler:including Osomatsu's own family]], and her full knowledge that [[spoiler:Osomatsu is a piece of crap]]. This, ironically, becomes reasonable when one knows that she's now [[spoiler:a single mother, divorced with a husband she had married before knowing well]]. She probably had, and still has, poor judgement of a man's character. In some sense it's [[StatusQuoIsGod the nature of this series]] which saves her from further misery.

* Related to the colour scheme; Iyami has a tendency to confuse Osomatsu and Todomatsu with each other. While this is a ContinuityNod from the *-Kun* days, Oso and Todo also happen to wear red and pink, colours that are closely related and could possibly be mistaken for each other depending on the lighting.

* In November 2017, the Osomatsu San announces their product collaboration with the Franchise/UltraSeries and the six Matsuno brothers are compared to their Ultra Brothers counterpart respectively. In case of Jyushimatsu, he is dressed as Series/UltramanAce. Not only they were the fifth brothers, Jyushimatsu is also the only Matsuno siblings to have his own girlfriend (the country girl), alluding to how Ultraman Ace used to have two human hosts.

* Remember that Jyushimatsu was the only one out of the older brothers who didn't sabotage Todomatsu's reputation in episode 7? This wasn't until the second skit on episode 14 revealed that Jyushimatsu also had a secret life like Totty (revealing that his secret account had been depleted due to fraudulent case), and that the reason why he didn't join his older brothers in episode 7 was due to understanding of the latter's situation.

* Although the "Valentine's Day" skit in season 2 (which ended with the Matsuno brothers turning into Namahages and hunting chocolates) is considered funny, one needs to remember that the one who leads the sextuplets is Jyushimatsu, instead of Osomatsu. This is played further when you realized that he is the only Matsuno brother to have ever experienced a romantic life (and gets rejected in the end), thus making him leading the Namahage troop being all the more sour.

* Although the "Valentine's Day" skit in season 2 ended with the Matsuno brothers turned into Namahages and hunt chocolates is considered funny, one needs to remember that the one who leads the sextuplets are Jyushimatsu, instead of Osomatsu. This is played further when you realized that he is the only Matsuno brothers to have ever experience a romantic life (and gets rejected in the end), thus making him leading the Namahage troop being all sour.
** [[https://www.pixiv.net/member_illust.php?mode=manga&illust_id=67402934 There's a fan parody]] showing Jyushimatsu, as a Namahage, breaks into a country house, [[spoiler: only to find the Country Girl inside, ready to hand him chocolate]].

* In "Osomatsu in Hell", the sextuplet was sent to hell by King Enma due to the lack of good deed in their past life. Although they are truly justified by this, why didn't Hijirisawa sent Jyushimatsu alone to heaven? [[spoiler:Considering that Jyushimatsu is the only one who shows care for Hijirisawa in the real world]].

** Todomatsu's secondary defining character trait is his desire to distance himself from his brothers so they don't drag him down socially. If you look at the Matsu colour scheme, Todomatsu is the only brother whose signature colour (pink) isn't part of the standard rainbow:

* In Season 2's ''Let's Get a Job'', Matsuyo and Matsuzo calls over their sons to confront them being NEET adults. The order was: Osomatsu, Ichimatsu, Jyushimatsu, Karamatsu, Todomatsu, and finally Choromatsu. This is the reverse order of them leaving the house in ''Letter''.