The first appearance of Nibbles (later known as Tuffy).
The first Tom and Jerry cartoon animated by Michael Lah, who previously did in Puss Gets the Boot (1940).
Last Tom and Jerry cartoon animated by Irven Spence until The Cat Concerto (1947) and The Invisible Mouse (1947) when he returned from this short.
This is the first Tom and Jerry cartoon where Fred Quimby is credited.