Development Hell - The full music video for Beep Beep was supposedly going to be released in late May 2013. They released it in early December 2013 instead.
Easter Egg - In "I Got A Boy" when Jessica says "Don't stop, let's bring it back to 140", she means it. The song does go back to 140, not only in bpmnote beats per minute, but it also goes back to the 1:40 segment in the mp3 file (only in the song itself, not in your music player).
For Taeyeon, we have: Kid Leader, Taeng, Ahjumma ("middle-aged lady", mainly because of her laugh), Umma (mother), ByunTae ("pervert"), Taengoo (goo means "9" in Korean, this is the reason why her jersey number on Oh! was 9), Taeng DJ, MungTaeng, Kkokkoma, Taeyeonnie, OST Queen, Leonardo Da Taengsinote because of the drawings on her instagram account (which was lovingly dubbed as "Taengstagram").
Sunny: Aegyo Queen, Energy Pill, Danshin (shorty), SoonKyu, Sunny Bunny, DJ Soon, Ssun, Strong Sunny
Tiffany: Fany Fany Tiffany, Manager Hwang, Jackson Hwang, DdilFany, Brighter Than Gems note boseok boda bitnaneun, Brighter Than Mushrooms note boseot boda bitnaneun. Due to Tiffany's mispronunciation., Miyoung, Rapper Hwang, DJ Hwang, Fang DJ note The Korean "hw" sound is the equivalent to the English "f" sound, Secretary Hwang, Ppanyang
Hyoyeon: Dancing Queen, Kim-choding, Specialist HY, Dancing Machine, Hyorengi (Tiger), Kim Yeolsal note 10 years old
Yuri: Black Pearl, Yul, BK Yuri, Kkab Yul, Prankster Yul
Sooyoung: Shikshin, Happy Princess, NaSoo (interrupter), DJ Syoung, Sooyoungie
Yoona: Deer Yoona, Him Yoona note Same as "Power Yoona". Him is the Korean term for power, Flounder, Nam Choding, Alligator Yoona, Yoong, Saseumi, Im-choding, Saebyuk, Goddess
Seohyun: Maknae, Seororo, Seobaby, Seobot, Gguk Gguk Ee note a Korean term which means "doesn't get angry", Hyun, Joohyun, Angel Maknae, Innocent Seohyun, Milk Seo Joo, The youngest Princess, SEOnoop Dogg, Sweet Potato Princess.
He Also Did - Taeyeon and Seohyun served as voice actresses (Taeyeon as Margo and Seohyun as Edith) in the Korean version of Despicable Me.
Tiffany. She was a big fan of Kim Hyun Joong (the leader) of SS501 back when she was still a trainee (check out her pre-debut Q&A here). On an episode of the now-defuct Korean TV show Star Golden Bell, SNSD got to guest-star with the members of SS 501 themselves. And when the host conducted a survey in which the members of SS 501 picked the most popular / their favorite SNSD member, they picked Tiffany. (That includes Mr. Kim Hyun Joong). After that, Kim Hyun Joong stated that he looks up Tiffany on the internet. Fangirling from her side most likely ensued.
Sunny also had a fangirl moment when her idol Lee Bumsoo (a famous Korean actor) became SNSD's acting teacher on Horror Movie Factory.
In MTV Lifestyle, we have Seohyun's own fangirl moment when she visited the Keroro dubbing studio. She even got to dub Keroro's voice!
Scully Box - The girls range in height from 155 cm (Sunny) to 170 cm (Sooyoung). While there's not much they can do about the massive differences whilst performing, photoshoots are another matter, and often result in the employment of these. See here and here◊.
Prior to their debut, SNSD went through several line-up changes. SM planned to have 11 girls in the group, one of which was Soyeon of T-ara. The group would be A LOT different today had they gone through with this. Read more on the roster history here
During their time as trainees in SM, their group's name was "YeoDan Team".note From 여자 단체(Yeoja Danche) which means "Female Group" - "Yeoja Danche team" literally translates to "Female Group Team" The name "Super Girls" was preferred by the press and the netizens.