Overlay different versions of the same sheet (or two unrelated sheets).
Identify issues during constructability reviews by overlaying HVAC plans and lighting plans, for example. Avoid change orders later.
It can be tricky to keep up with evolving drawings. Compare sheets in the revision history to pinpoint exactly what changes are affecting the budget.
Plan for the least amount of interruption. In road or highway work, for example, overlay temporary routes on Traffic Control Plans.