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bells and whistles n.
[common] Features added to a program or system to make it more [flavorful] from a hacker's point of view, without necessarily adding to its utility for its primary function. Distinguished from [chrome], which is intended to attract users. "Now that we've got the basic program working, let's go back and add some bells and whistles." No one seems to know what distinguishes a bell from a whistle. The recognized emphatic form is "bells, whistles, and gongs".
It used to be thought that this term derived from the toyboxes on theater organs. However, the "and gongs" strongly suggests a different origin, at sea. Before powered horns, ships routinely used bells, whistles, and gongs to signal each other over longer distances than voice can carry.