This can be a very interesting part of the note making, as you look back on what you once thought or understood about certain texts -- both where you have changed and where you have remained the same (or maybe even strengthened a view).
About fifteen years ago I wanted to accept paedobaptism. I had already embraced much of Reformed theology and believed that baptism was the last domino to fall. I could then become a Presbyterian and my journey would be complete. I went over my old notes on texts that dealt with baptism and started looking for holes in the Baptist view. I joined a Reformed message board looking for answers. I was convinced it was only a matter of time. But to your point, my view on baptism did not change, it strengthened. Some beliefs and practices did change but not my Baptist distinctives. Then there are those things that make me cringe. I read some of what I wrote in the early 80s and say to myself, "Did I really write that?"
I also have some interesting notes down in my Ryrie bible recorded down, back from my Bapticostalist days! And water baptism actually is first to fall if one ceases to be a Baptist!