Hey There, It's Yogi Bear

The first theatrical feature from Hanna-Barbera Productions. It was successful enough to encourage the studio to produce another feature - The Man Called Flintstone (1966).

In one of the first few scenes of the movie, when the Ranger is queued up in his car while Yogi is "inspecting" picnic baskets, Yogi reads a card from the Ranger, identifying himself as "John Smith, Chief Ranger, Jellystone Park."

At the very end of the movie, as they're on their way back to Jellystone Park in the helicopter, the Ranger finishes a phone call from the Commissioner, telling the others that he's "just been promoted" to Chief Ranger. This means he obviously wasn't "Chief" Ranger at the beginning of the movie.