You need t be to be in the right frame of mind to imbibe a different critical sensual perception of the world. Seemingly very little happens in the film; it is a subtle allegory. Very little, is the point, as the changes wrought are not the tanks rolling into the square to announce a new beginning. The film operates on the idea of subtle coercion, gently enforcing boundaries, including tough cajoling needed to create a docile mass. AA boundaries are enforced by a mirage, of capturing people within a spell and then getting them to enforce the order themselves. Compliance is needed as much as duress and then people police themselves.
Offering people bonhomie, food, platitudes, whilst forever shaping them to external expectations, becomes the critique, delineating how people create conformity. The film has a very Kafkaesque feel to it. The throng gazing onto a leader, encroaching upon their everyday space with overarching expectations. The bourgeois participants are then ensnared into a world where they accept what is being offered. They adapt to its expectations and denounce those closest to them, those who fail to conform to the herd values.
A critique of totalising communism, of course, but a hidden critique emerges when reflected upon the West, not the East. Bathing, drinking wine, the demarcation of gender, the everyday encrochment of officialdom is more applicable to a "democracy" than an overt survellance state.
Spins a wire back to "The Trial" and "The Castle" with its allegorical surrealism, which chimes with the presentation of life within a modern world vista.
When it appeared in 1960's Czechoslavakia it must have been an hilarious pastiche of life under duress. Within modernity it applies to those who have adapted to the strictures of liberal democracy without a second thought. This is how it is, was and ever shall be.
What is missing is a speech from the leader about straying into the woods, because it may be full of terrorists or paedophiles. That would have capped it off, but still letting the Alsatian loose on those who do not conform, after building himself up to be the wounded party shows some psychological insight into the application of power. Arming one of the former friends with a rifle, to shoot his former friend and any of the others, in effect enforcing the new moral order is prescient.
One to watch again and again to get the "joke" as this is as subtle as it gets, akin to a Harold Pinter play.