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The film is a parody of Disney's Fantasia, though possibly more of a challenge to Fantasia than parody status would imply. In the context of this film, "Allegro non Troppo" means Not So Fast!, an interjection meaning "slow down" or "think before you act" and refers to the film's pessimistic view of Western progress (as opposed to the optimism of Disney's original).

A paralyzed girl finds difficulty living a normal life, so she participates in a ritual to metamorphize into a mermaid to replace her useless lower half.

Danny O'Neill and Hank Taylor are rival trumpeters with the Perennials, a college band, and both men are still attending college by failing their exams seven years in a row. In the midst of a performance, Danny spies Ellen Miller who ends up being made band manager. Both men compete for her affections while trying to get the other one fired.

During the Florida land boom, the Marx Brothers run a hotel, auction off some land and thwart a jewel robbery.

Showman Jerry Travers is working for producer Horace Hardwick in London. Jerry demonstrates his new dance steps late one night in Horace's hotel room, much to the annoyance of sleeping Dale Tremont below. She goes upstairs to complain and the two are immediately attracted to each other. Complications arise when Dale mistakes Jerry for Horace.

Six actors portray six personas of music legend Bob Dylan in scenes depicting various stages of his life, chronicling his rise from unknown folksinger to international icon and revealing how Dylan constantly reinvented himself.

A Gay-Nineties musical set in NYC's Bowery and East-Side explores the life of its inhabitants--an Irish policeman and his tap-dancing daughter and music-hall wife; a German professor of music and his singing daughter; and an Italian café-owner, a kindly priest, a struggling young doctor and a saloon-keeper. And a political ward-heeler, Terrence Dowd, who has a deceptive and dishonest plan to sell them all out in order to build a fight arena. But he meets his match in property-owner Claire Adamson.

In this surrealistic and free-form follow-up to the Monkees' television show, the band frolic their way through a series of musical set pieces and vignettes containing humor and anti-establishment social commentary.

Youthful Father Chuck O'Malley led a colorful life of sports, song, and romance before joining the Roman Catholic clergy. After being appointed to a run-down New York parish, O'Malley's worldly knowledge helps him connect with a gang of boys looking for direction, eventually winning over the aging, conventional Parish priest.

The jobless Somaa is happily married to Lola. He finds a job as a secretary at a fashion house owned by the spinster Howayda, who lives with her brother Fawzy. But as the job requires that the secretary be single, Somaa claims he is. When Lola finds out, she asks Somaa to quit, but he refuses, so she starts working as a model for Howayda, whereupon Fawzy falls for Lola and proposes to her.