Actor Allusion: Azusa has one in the anime, though not to her seiyuu's previous roles but her previous job as a gravure idol. Azusa was asked to do a gravure idol audition and was asked to pose. Cue Male Gaze. On boobs.
Also in the anime, Haruka smacked herself in the face with a box lid on national TV. Her seiyuu had done the exact same thing on an online web show several years ago.
Iori will sometimes cry out "Urusai urusai urusai!" That's Shana from translation Shakugan no Shana's catchphrase, which is commonly quoted by other characters of the same general archetype. Especially if they share the same voice actor - which in this case they do.
Bonus Episode: The Live For You and Shiny Fiesta OVAs came bundled with their respective games.
Dueling Shows: The anime aired in the same season with... Uta No Prince Sama. Moreover:
The protagonist of UtaPri is named Haruka mi. The girl considered as the main character of iM@S is named Haruka Nana mi.
Ama Both shows feature twins, although Shou's twin brother Kaoru does not appear in the anime.
Tokiya and Chihaya are quite alike in demeanor and looks.
Both shows are centered on music and showbiz, with iM@S on the more realistic side of the scale compared to the loftier fantastical UtaPri side of the scale.
Hey, It's That Voice!:
Chihaya - Tsubaki Yayoi, and Makise Kurisu
Haruka - as another Haruka and Nakatasugawa Ui
Ami/Mami - Rin & Len Kagamine, Yamada Chika and Koizumi Chika
Yukiho - Akira. If we go by her previous voice, it's Thursday the Robot
Azusa - Litchi Faye-Ling, Takako and Nanami
Iori - Rise Kujikawa, Nena Trinity, Kagura and lots and lots of Shana Clone. Need we say more?
Makoto - Kamui Tokinomiya, Mao
Hibiki - Arata, Kenji, Panky
Yayoi - Lilica Felchenrow, hyperactive as ever.
Miki - The Japanese voice of Mia/Wayu.
Kotori - Mei-Fang and the Japanese voice of Elincia.
Touma - Apollo, Kouta Azuma, (adult) Desil Galette... Oh, Crap
Hokuto - Chris Weatherfield
The Other Darrin: From iM@S2 onward, Yukiho's original seiyuu, Yurika Ochiai, was replaced by Azumi Asakura.
Portmanteau Series Nickname: iM@S.
Relationship Voice Actor: In the Puchimas anime, Tora Dora stars Junji Majima and Rie Kugimiya voice The Producer and Iori, respectively. However, this is the first time Junji has voiced someone in the franchise, while Rie has voiced her character since its inception.
Rikka Takanashi, Shinka Nibutani, Kumin Tsuyuri, and Sanae Dekomori from Chuunibyou share voice actresses Maaya Uchida, Chinatsu Akasaki, Azumi Asakura, and Sumire Uesaka, respectively, with Ranko Kanzaki, Akane Hino, Yukiho Hagiwara, and Anastasia.
Talking To Herself - Ami and Mami are both voiced by Asami Shimoda.