The character Brick, played by Atticus Shaffer, is rumored to have Asperger syndrome or some sort of autism. He also possesses eidetic memory. He also has osteogenesis imperfecta type 2 which causes him to break his bones easily.
Sue's birthday is actually inaccurate. She was born on Leap Day, February 29th, which only occurs once every 4 years. To fit her age group and Leap Day, she would've had to have been born in 1996, a leap year. However, this is not the case. Sue celebrated her 16th birthday in 2013, meaning she would have had to have been born in 1997, making her birthday incorrect.
Sue's birthday is mentioned several time as being the 29th of February, which is the Leap Year Day. However, this is impossible. Sue graduated High School in 2015, which - with a February birthday - means she would have had to have been born in 1997. As the Leap Year occurs only ever 4 years, and each year is a multiple of 4, the closest Leap Years to Sue's birth would have been 1996 and 2000, which would mean that in 2015 she would have turned either 19 or 15 respectively. There was also no mention of Sue's birthday in s.7, despite 2016 being a Leap Year, though she is referenced as being 19 years old in s.7 ep.18 which first aired in March, meaning she has celebrated her birthday already.