Ear Worm: STOP THE PIGEON!, STOP THE PIGEON!, STOP THE PIGEON!, STOP THE PIGEON!, STOP THE PIGEON!, STOP THE PIGEON!, STOP THE PIGEON!
The background music, especially the rinky-tink piano chase music, would be used on numerous H-B shows henceforth up to around 1980. The New Scooby-Doo Movies episode "The Ghost of the Red Baron" uses it virtually exclusively.
Fridge Brilliance: Given that attempting to catch a pigeon is preferable to fighting in World War I, the Vulture Squadron's failures may be on purpose.
In "Fur Out Furlough", when the General offered a 30-day furlough to whoever caught Yankee Doodle Pigeon, Zilly planned to spend it in Miami and Klunk planned to spend it in Hawaii.
Hilarious in Hindsight: Muttley growling at Dastardly to be included at a furlough Dastardly had just claimed as his became even funnier with how Muttley would later react in Yogi's Treasure Hunt whenever Dastardly claimed the treasure of the week as all his.