It's always going to be a judgement call, always. But, given that in most theaters, the performance report list is vast, and the ability to send it on . . . you have a fine line to walk. And this is wear tact, experience, and management skills come in.
If you are working in an AEA house, then I feel like "Acting" notes should not make it into the report. Other then, something like . . .
"Different moment in TO BE OR NOT TO BE - will discuss with Mr. Olivier"
As far as these specific questions . . .
- A child actor mugging too much
Did the child actor mug at opening? Is that the performance I need to maintain - again, may put "Mr. Harris's moment is growing in the present opening scene, note to be discussed."
- An actor skipping a line
"Some line issues in the second scene, notes given to all actors in the scene"
- An actor skipping an entire page
"Page of text skipped in the last scene. Will discuss with all actors in the scene"
- An actor adding a bit of business
"The making tea portion of the show might grow into it's own little own act. SM will discuss with Ms. Redgrave"
- Changes to choreographed combat.
This one scares me . . .
"Fight Choreography was off tonight. SM will discuss and actors and fight captain, and we will work in detail during fight call tomorrow."
BUT - it wholly depends on the actor, the show, the director, the power I am given to maintain the show (Sometimes, as SM, I defer to a resident director to maintain the show.)
I also try to make my reports readable, and slightly entertaining themselves - often the people you are sending reports to are reading five other show reports as well.
I think my target audience for a performance report is the producer.