Page 306. " I was to attend the Beauregard School "

There are several Beauregard Schools in the country and two in Louisiana. Neither of them are in New Orleans, however.

 

Private high schools in New Orleans

Page 312. " We are in the middle of discussing Edgar Allen Poe and his short story The Murders in the Rue Morgue "

Ruby's new class is reading The Murders in the Rue Morgue by Edgar Allen Poe. Published in 1841, the short story is known for being the first detective story.  The story follows a man who solves the murders of two women. In the story, the murderer is an animal.

Wikipedia: The Murders in the Rue Morgue

  

 

Page 313. " they're fraternal twins and not identical "

Ruby and Giselle are identical twins. They look very similar. Identical, or monozygotic, twins are produced when one egg is fertilized which divides into two separate embryos. With fraternal twins, two eggs are fertilized instead of one.

 

Wikipedia: Twins