The following wartime public service announcement "fades" into the closing title card, sandwiched between "The End" and the miniature MGM reclining-Leo-the-Lion-and-torches insignia logo: "America needs your money. Buy War Bonds and Stamps in this theater." Apparently MGM attached this PSA to many of its short subjects released during 1942; it also appears at the closing of Chips Off the Old Block (1942) and Our Gang's Surprised Parties (1942), among others.
Brickbat, the red bat, resembles the dwarf Dopey from Disney's Snow White and the Seven Dwarfs (1937), but the mannerisms of all three bats together are a nod to the popular comedy trio, The Three Stooges.
As often seen in the early animated shorts, the background scenes are carefully and meticulously rendered: cobwebs, bells, wooden beams, rope, etc.