When I was a sub, I left very detailed notes as well. I let the teacher know what had or hadn't been accomplished from their lessons, as well as any problems with students. I would also mention who was exceptionally well behaved if someone was really standing out.
Now as a teacher, I expect the same. I've had a sub in my room one time, and the note I received (after her being in my room for 2 days) was one sentence long. Literally. She said, "For the most part they were good, but some of the boys gave me a hard time." I had no idea what had been completed. I had no idea which boys were causing problems. I had not idea what she meant by "for the most part."
Keep leaving detailed notes....They will be appreciated!