Catharsis is an emotional discharge that brings around a sense of renewal or welcomes relief from some sort of tension.
Irony is considered one of the most important terms. It refers to how a person, situation, statement, circumstance is not exactly what it seems to be. There are three types of irony, verbal, dramatic, and cosmic. Verbal irony is when the speaker means something different than what heshe is saying; also the audience realizes that because of the knowledge they already have that the opposite of what the speaker is saying is true. Dramatic irony is when the characters do not know facts but the audience knows them. The third irony is cosmic. Cosmic irony is when some unknown force brings about dire and dreadful events.
Two more important terms are protagonist and deus ex machina. A protagonist is considered to be the main character. The protagonist may also be the considered the hero of the piece. Deus ex machina is when someone or something enters the action and changes the protagonist's fortune.
In the original commercial, one of the first things noticed would be that the character with the frog is the protagonist. This is made obvious by her becoming the main focal point