Finding cells that include formulas in them can sometimes be a bit like looking for something in the dark. To help you illuminate your spreadsheet surroundings, Google introduces the ability to reveal all formulas with one click. When you're comparing formulas with one another or trying to figure out where your formulas aren't working, showing all formulas should help you out. You can turn this feature on from the formula bar by selecting the 'Show All Formulas' button, selecting 'Show All Formulas' in the View menu or hitting Ctrl `.
Flip the switch in your spreadsheets to try it out.