Cheep-Cheep, the bird whom Bright Eyes rescued, behaves and barks like a dog the same way the chick behaves when encountered by Scooby Doo in Jeepers! It's the Creeper!
When Cooler, Nose Marie, and Bright Eyes are transformed into "Boxers" by Howler's Disguise-o-Pupper, Cooler impersonates Sylvester Stallone's character, Rocky Balboa