How to highlight all of the formula cells in a spreadsheet
Select all cells using the icon northwest of A1
Home, Find & Select, Formulas
or, Find & Select, Go To Special, Formulas
Once you have the formulas selected, use Cell Styles or a Fill Color
Look for things that should be formulas that are not!
Once you have the formulas selected, you can use Trace Precedents
Or, if you turn of Edit Directly in Cells, Double-Click
Once you have multiple cells selected, press Enter to move to the next cell