less obvious shakespeare references?

i noticed a whole host of shakespearean references in this film, some of which I thought were quite well hidden. Not sure if anyone has made a list like this yet, but I'm interested in ones I may be missing:

obvious:
name of high school (Padua, location of Taming of the Shrew); names of sisters; last name of sisters (Shakespeare's birthplace); overall plot; multiple direct quotes from sonnets, Taming of the Shrew, Macbeth, etc; Patrick Verona last name; absent mother

less obvious:
fascination with maidenhood / virginity of female characters; small characters who make frequent, overtly sexual puns (the principal); the girl who says she is secretly in a relationship with Shakespeare (perhaps a reference to the unnamed "fair youth" for whom sonnets were written)

obscure:
scene performed almost entirely in french (Henry V); the idea of "stopping the mouth" of an opinionated girl with a kiss as a type of deus ex machina (Much Ado); songs whose lyrics discuss the themes of the plot ("Cruel to be Kind" song at the prom.. perhaps a reference to apropos songs in Tempest, Much Ado, As You Like It, etc)

there are probably a few that I noticed that I'm forgetting to write here. But curious if anyone else noticed any references. Particularly I'm interested in the obscure ones, which made me smile... :)