Are Manners Important? (1954)

In this Encyclopedia Britannica Film, the actions and experiences of a thoughtless elementary school boy who maintains that "kids don't care about manners" provide a basis for discussing the importance of manners.

Lunchroom Manners- Coronet Films- 1960

Of all the classroom instructional shorts made in the twenty years or so after the Second World War, this is probably the most well-remembered due to its inclusion in Pee-Wee Herman's HBO special back in the early Eighties.

Mind Your Manners-Coronet Films, 1953

From IMDB:

The benefits of being unfailingly polite and well-mannered to everyone are illustrated in this film, which shows teenagers that being polite and well-dressed is the key to making everyone like you and adults--and, more importantly, authority figures--think that you're not a juvenile delinquent.