Customize the Reference Icon Pop-up

As most ServiceNow users know, when you hover over the icon next to a reference field on a given form, you can see some details about the record that's being referenced. 

Well, what if you want to customize what fields are shown in that pop-up reference view? 

When a requirement came through to do just that in my instance, I was stumped for a good long while, chasing down some inaccurate/outdated documentation, but eventually I figured out the following process. 

Join me after the jump to see how to modify this pop-up view. 

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