Flags in the Adventure of Milo and Otis - 1989

 The Adventures of Milo and Otis tells the story of a kitten and puppy who become life long friends.  After growing up on the farm together they journey in the wilderness.  In one adventure, they get separated and are subsequently put on a quest to find each other.

During the beach sequence by a old fishing shack,  flags make a short appearance.  The top flag is white, the middle flag is black and the bottom flag is blue.

An interesting note about this film is that it's recycled-cinema, originally made from a Japanese movie in 1987.

Here Milo runs into an abandoned shack for shelter.