Go to the audio commentary section of cd2, go to main menu button and push the "up" button, you'll see that there are little windows at the house next to commentaries which you can activate. There are two bloopers, both with Jack.
In case you can't find them...
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I accidentally looked at the wrong disc and figured out that there are hidden messages from Jack to Jane on the first cd, same section as the blooper ones.
The first note says:
Jane,
You are extremely disappointing. Love, Jack McBrayer.
The second one:
Dear Jane, I am so, so sorry about your incompetence. You are in my prayers. Love Jack McBrayer.
I'm wondering what this is all about.
ETA: I made screencaps of the notes