I'm glad you had an enjoyable hike! And I would definitely agree that the final stretch of this hike along the Big Flat Brook is beautiful, as I have visited that section several times through the years and also enjoy the peacefulness of those woods.
We would certainly suggest trying to keep up with the latest maps for parks in our area. People are often surprised just how often trails can change, and we try to keep most of our maps updated on a 3-4 year cycle to keep up with the latest changes. In this case, our Kittatinny Trails map set was revised in 2016, and especially for the Stokes State Forest area, it was a significant update that included these blaze changes related to the Blue Mountain Loop Trail. We are currently working on a revision to the maps that will come out in 2020, and any additional blaze and trail changes in this area (such as sections that have old blazes removed, as you mentioned above) will be incorporated into this map update. I've also taken a close look at the description, and for the 2nd issue you mentioned regarding the Cartwright Trail, the right turn off the red Swanson Trail is noted a couple paragraphs above the part you mentioned. The left turn after the panoramic viewpoint is correctly described.
Trail Conference Cartographer