Question:  When a comment has been inserted in a cell, the little red triangle is not being displayed to indicate a comment in a cell. What can I do to remedy this in Excel?

Answer:  Under the Tools menu, select Options.

When the Options window appears, select the View tab.  Select the option called "Comment indicator only".

Now when you return to the Excel spreadsheet, you should see the comment indicator. The comment indicator is the red triangle positioned in the top right corner of the cells that contain comments.