Disney's The Many Adventures of Winnie the Pooh was first released in 1977.
The film is an anthology that combines three previously released Pooh featurettes: Winnie the Pooh and the Honey Tree from 1966, Winnie the Pooh and the Blustery Day from 1968, and Winnie the Pooh and Tigger Too from 1974.
Rather than presenting three completely new stories, the 1977 production connects those shorts with new bridging material. It also adds an ending inspired by Christopher Robin's departure for school, giving the compilation a more unified emotional conclusion.
The film was released on March 11, 1977, on a double bill with The Littlest Horse Thieves. Its structure explains why some viewers remember the individual short films as separate productions while still identifying the compilation as a feature-length Disney movie.