: The premiere was watched by approximately 1.73 million viewers.
: Ally discovers she has a missing library book, which the school claims she never returned. This outstanding debt threatens to prevent her from graduating with her class. Austin takes it upon himself to track down the book to ensure she can walk across the stage. [S4E17] Cap and Gown & Can't Be Found
: This was the 16th episode filmed for the final season and serves as a major milestone as the main characters finally graduate from high school. : The premiere was watched by approximately 1
: In her quest for yearbook photos, she even manages to touch the heart of her longtime "frenemy" Chuck, who asks her to sign his yearbook. [S4E17] Cap and Gown & Can't Be Found
The episode follows two primary storylines as graduation approaches: