This was the last W7 cartoon to use the Hanna-Barbera falling object whistle. The last W7 cartoons McKimson made in 1969 never used it.
On Nickelodeon airings of this cartoon, the final chase scene abruptly faded to black for closure; so, there may have been an edit involved.
This is the first cartoon since 1964’s False Hare in which is directed by Robert McKimson in his own unit due to his cartoons he directed in the Depatie-Freleng era were in Friz Freleng’s unit.