Do you mean as a picture to show the overprint?

The best way is a combination of using a scanner and some photo editing software. The one thing that helps is that overprints are usually a single, solid color, which allows you to 'erase' all of the other colors, leaving the overprint.

Command & Y

150 usd

"HAWAII" overprint bills were only issued during WWII. A "D" series letter indicates this bill was printed between June 1949 and January 1953 so it couldn't be a genuine overprint.

Please check again and post a new, separate question.

This is called an Inverted Overprint error and can be worth anywhere from $150 to $400 depending on the bill's condition.

US paper bills are printed in multiple stages. An inverted overprint occurs when a sheet of bills is accidentally fed upside-down during the step that prints the serial numbers.