One of the films included in the 1978 book "The Fifty Worst Films of All Time (and how they got that way)" by Harry Medved and Randy Lowell.
The entire background music score was composed for and played by a single, solo harmonica. This was the first dramatic feature film to have such a score.
There was talk of a sequel, to be titled 'Dondi Goes Native in Brooklyn,' and a television series, but neither materialized - probably because of the poor box office performance of this film.
A census taker named Alan Cory spotted David Kory playing in the street, and brought him to the attention of producer-director-writer Albert Zugsmith, who cast the boy in the leading role. Cory was rewarded by being hired as dialogue director for the film.
The casting of the leading role was narrowed down to two candidates: David Kory, who got the part, and Damon Lanza, the son of actor-singer Mario Lanza. Lanza's agent asked for too much money.