The electrician came back on Friday and replaced the red wire nut with a blue (or purplish blue) wire nut. I called the inspector and left a message to find out what happens next and he called me yesterday morning and asked if he could stop by. He took a look at a photo I took of the change (before the electrician closed the box back up) and said all was A-ok. Hurray! Now I just need to double check on the state website in the next couple of days to make sure that the permit is indeed approved.
No more work on the house for a bit. Too exhausting!