To identify why certain cells are not showing in your printout in Excel, try the following steps:

1. Check the print area settings for the cells, to make sure they are set correctly.
2. Ensure the sheet is scaled to fit the entire contents within the margins for the page.
3. Print or preview the document to make sure the hidden columns and rows are not being shown.
4. Check the print settings to make sure the hidden cells are not being printed.