The Manhattan Cocktail.

The Manhattan: When taking an order for said cocktail, offer "sweet, dry or medium"; This way no-one is under the delusion that a mixture of sweet and dry vermouth is in someway "perfect".

The Backbar

The Backbar: Resist the urge for completism, only stock products that you know and love; And more importantly, only stock products that will sell; A selection is better than a collection.