She's The Man vs Twelfth Night
Comedy Of Manners
In the play an example of Comedy of Manners is when Malvolio believes the love letter that was given to him. The love letter was a trick to make Malvolio do all the things Olivia hates but everything in the letter are things Olivia hates. He had to dress up in yellow tights and Olivia hates the color yellow which is assuming because he made a fool of himself.
Comedy of Ideas
coming down this walk: he has been yonder i' the sun practising behavior to his own shadow this half hour: observe him, for the love of mockery; for I know this letter will make a contemplative idiot of him. Close, in the name of jesting! Lie thou there, Throws down a letter for here comes the trout that must be caught with tickling."
In the movie an example of comedy of ideas is when Viola tells her hairstylist/friend that she wants him to transform her into a man so that she can pretend to be Sebastian. He is surprised at her request and tells her that there's no way that she'd be able to pull it off.
Olivia falls in love with who Viola impersonates.
Both the play and movie use the quote “Be not afraid of greatness. Some are born great, some achieve greatness, and others have greatness thrust upon them.”
Olivia is upset in the movie because her boyfriend dumped her but in the play she is upset because her brother died.
In the play things are more dramatic and Viola gets married to Duke, Olivia and Sebastian get married, and Maria and Sir Toby get married. While in the movie Duke and Viola end up dating as well as Olivia and Sebastian.