Main cabin door/baggage door/service door for dents. Dents are commonly overlooked and take a long time to map out and check to see if they are within limits...

For whatever reason, no one ever checks for debris in the headset jacks... very commonly missed.

Cockpit seats need 2 fore/aft adjust levers in case one breaks, you have another to adjust your seat. Since guys put their feet on these, they break and are commonly missed.