When you walk backstage, look at the black boxes on the left to see a blue rectangle on one of them. That's Grigor's tablet. Pick it up; he may make annoyed comments about you doing this, but he won't stop you.
"Stage notes" you can read any time, and he keeps adding to them, so check back here occasionally.
"Personal notes" requires a password. You can find a hint about that password in Xenia's copy of the script.