This gas station pump asks for your zip code when you enter your credit card. Then you have to search around for where to enter it. The keypad is set off to the right and inset.

It doesn’t appear to have any relationship to the screen where the message displays, causing a brief moment of confusion as you scan for an interface to obey the screen commands.

Pay attention to gestalt principles. Elements of an interface that are related should appear to be so visually via position, color, size, borders, whitespace, etc.

Make related elements obviously, visually related, and you will cause less moments of confusion, less scanning, and less frustration.