The abysmally poor syncing of dialogue in post-production merely has the effect of conveying the idea that the audience's comprehension of Fellini's work was a mere afterthought and/or as if the idea of having dialogue itself was a vulgar concept, imposed by some external force without his express approval onto his otherwise perfect artistic project. (I'm sorry, I just don't like Fellini.)
Fellini undertook in La Dolce Vita to provide a Dantean vision of the modern world as viewed from the top instead of the bottom. Unfortunately, there is more to a great film than a great conception, and Fellini has enlarged his material without expanding his ideas. Consequently, the film is as bloated as the fish which terminates the orgy sequence.