- Bel Kaufman, the author of the book on which this movie was based, appeared as an extra in the movie, and served as a technical advisor.
- The U.S. State Department submitted this film to the 1967 Moscow Film Festival, in order to contradict Soviet propaganda, which implied that all American schools were racially segregated.
- Like Dangerous Minds (1995) 28 years later, this movie was filmed in a real-life urban high school building, using real high school kids from the neighborhood as extras, many of whom were believed to be armed on the set.
- The winter scenes were filmed on a hot day in August 1966.
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