What are some comedic devices in act 1 of Twelfth Night?

Shakespeare employs many comedic devices in act 1 of Twelfth Night. These include crossdressing, mistaken identity, romantic entanglements, slapstick, and love letters. Even music can be thought of as a comedic device by the way it is used to heighten or advance the comic action of the scenes. Although each device is funny as a separate element, when used in tandem, the devices create a humorous domino effect.
For instance, Viola’s decision to disguise her gender by dressing as “Cesario” results in her landing a position in Orsino’s household. She soon realizes she has romantic feelings for the Duke, but Orsino is in love with Olivia. To further complicate matters, when “Cesario,” acting as Orsino’s go-between, tries to convince Olivia to fall in love with the Duke, Olivia falls in love with “Cesario.” In this instance, crossdressing leads to mistaken identity, which in turn leads to a romantic entanglement or love triangle among Orsino, Viola, and Olivia. The love letters delivered during act 1 also function as comedic devices by the manner in which the characters respond to their content and the complications that arise from their delivery.
Each device also appeals to different audience members. While some playgoers might prefer the intricacies of a love triangle, others might relish the type of physical comedy demonstrated in scenes of rowdy drunkenness or in Feste’s antics.