Franchise: Mario

Yoshi's Story was the first Mario series game to be rated E for Everyone instead of K-A for Kids to Adults due to the changeover by the ESRB from the previously used K-A rating in 1998.

When Super Mario Bros. 35 and Super Mario 3D All-Stars were released, they were criticized for being preemptively planned to be pulled from digital storefronts on March 31, 2021. This, along with the DIC Mario cartoons coincidentally being moved from Netflix to Paramount+ on the same day, spawned an internet meme depicting Mario as receiving a medieval public execution by Nintendo on that date.

In the E3 2019 Nintendo Direct presentation, the new CEO of Nintendo of America, Doug Bowser, was introduced with a joke comparing his last name to the antagonist of the Mario series, Bowser. However, in Japanese, the character’s name is “Koopa”, so in the Japanese broadcast of the Nintendo Direct, they clarified the joke with subtitles explaining that his name is Bowser in English-language releases.

A popular internet joke upon the release of Super Mario 64 was "What happened to Super Mario 4 through 63?" If one is to calculate every Mario game released before Super Mario 64, including outliers such as ports and titles not released on Nintendo hardware like Mario Teaches Typing, the game would be the 113th title on the series. However, if you were to only count games released on non-devoted Nintendo hardware and remove ports, the title would be, very anti-climactically, the 63rd Mario game.

There is a cactus prop at Universal Studios' Super Nintendo World that does not originate from an official Mario game, but rather the fanmade mod Newer Super Mario Bros. Wii. At the time of the park's opening, a Google search for "new super mario bros wii cactus" would show images of Newer's desert levels alongside New Super Mario Bros. Wii, meaning that the cacti was likely added by accident, being mistaken for official Nintendo material.

Concept art for Paper Mario: Color Splash shows that the captain of the Violet Passage was at one point going to have a dark skin tone. This would've marked the first instance of a Toad with a distinct skin color (not counting usually-pale Toads under a transformation) in a Mario game, but not the first instance of a non-pale Toad in the Mario franchise as a whole. The Super Mario Bros. Super Show featured a one-off Native American Toad named Pronto, a parody of Tonto from The Lone Ranger, in the episode "The Provolone Ranger".

While Mario's mustache, red shirt and blue overalls were described by Miyamoto as the result of technical limitations, there's a possibility that they were also inspired by an issue of the Japanese men's fashion magazine Popeye, named after the fictional character that Mario was already partly inspired by. The March 1980 issue of Popeye magazine features cover art of a man with a mustache wearing a red shirt with blue overalls.

A common belief relating to Rare's work with Nintendo in the 1990s is that the Banjo-Kazooie series and the early family-friendly iteration of the Conker series were originally intended to share a universe with Donkey Kong. By extension, this would also connect them to the Mario series. This belief stemmed from Banjo and Conker's debuts as playable characters in Diddy Kong Racing, other shared characters (e.g. Gnawty, a beaver who appears in both Donkey Kong Country and Banjo-Kazooie), and other planned appearances like the Ice Key from the Banjo-Kazooie series' unused Stop 'n' Swop feature being found in the data for Donkey Kong 64. This interpretation was so popular at one point that the largest English-language Mario fan wiki, Super Mario Wiki, hosted articles about Banjo-Kazooie and Conker characters.

However, Banjo-Kazooie creator Gregg Mayles has stated that Rare's non-Donkey Kong games were never intended to share a universe with Donkey Kong, while Conker's Bad Fur Day director Chris Seavor has gone on to say that Banjo-Kazooie and Conker also do not share a universe.

On February 14, 2013, Satoru Iwata announced the "Year of Luigi" in honor of the character's 30th anniversary. Over the next 13 months until the end of the Year on March 18, 2014, Nintendo released several games starring Luigi, including New Super Luigi U, Luigi's Mansion: Dark Moon, Dr. Luigi, and Mario & Luigi: Dream Team. Additionally, Luigi was prominently featured in Super Mario 3D World and NES Remix 2, along with being featured in merchandise.

Beffitingly for Nintendo's famous underdog, Nintendo later reported $457 million in annual operating losses for 2013, making it one of the worst years in the company's history.

At an unknown time, Archie Comics pitched a comic adaptation of Super Mario to Nintendo, written by Ian Flynn with art by Tracy Yardley and Ben Bates. The existence of the pitch was first discovered after concept art was released on the site Comics Art Fan in 2015. Flynn would later post a thread about it on Twitter in 2019, revealing it was planned to begin as a four issue miniseries that would have become ongoing had it been successful. It would have focused on "narrative-driven adaptations of the games with stories bridging the canon", similar to that of Flynn's previous work on Archie's Sonic The Hedgehog and Mega Man comics. However, while the pitch was apparently well-received by Nintendo of America, it was rejected by Nintendo of Japan. Flynn later felt that the pitch was not how he would approach a Mario project in the present day, as it had "too much drama, not enough whimsy".

In 2022, Flynn revealed that Archie Comics' editor at the time Paul Kaminski had hoped to include Mario characters in "Worlds at War", a planned third crossover between the Sonic the Hedgehog and Mega Man comics. The story (which was noted to be similar to the "Secret Wars" storyline by Marvel Comics) would have taken place on a "battle planet" within the multiverse's nexus, and the Mario cast's unfamiliarity with the other heroes would have been used to help explain the crossovers to newer readers. This idea would not come to pass either, as Kaminski left Archie shortly after the second crossover "Worlds Unite" wrapped up, before having a chance to pitch the idea to Nintendo.