How to add blue dots to faces in Maya.
This should help find extra or unwanted faces on geometry in Maya without going into vertex faces mode. For example if you accidently clicked "extrude" on a face and without noticing.
0:00 - Demonstration of problem
0:05 - Windows
0:07 - Settings/Preferences
0:09 - Preferences
0:12 - Selection under Settings
0:14 - Select faces with: Center under Polygon Selection
0:16 - Save
0:19 Demonstration