Quiz has a very useful feature - displaying to the teacher the number of user overrides and group overrides, and actually providing hyperlinks to the pages where these overrides can be reviewed.

Lesson should also be equipped with this feature.

As a teacher I would very much like to know if any overrides exist just by visiting the Lesson page.

(In fact, if dates are set to display on the course page - some "overrides exist" warning could also be displayed - though this should probably be a separate improvement suggestion.)