The penants on the prisoner's walls are of other famous state or federal penitentiaries (Sing Sing, Folsom, Atlanta, and others).
Alcatraz is the prison spoofed here. AKA The Rock.
The caged avian in prison garb is a play on the term "Jailbird" which is slang for a convict. Decades later, the life story of prisoner Robert Stroud would be made into the film "Birdman of Alcatraz."