sorry i havent been around so long, its good see and hear that things worked out well for you!
anyways, as far as the seeds, either A) you somehow stressed (maybe light leak?) a female into turning hermie, which pollinated itself and a few parts on other ladies. or B) the plant was a hermie to start with and it went unnoticed.
seeded weed isnt automatically bad. we associate it as bad, but in actuality, it can be quite good. it depends on the grower. mass commercial brown brick weed has seeds, is garbage, but is not grown with care, and i doubt males are sought out and destroyed.
anyways, good genetics + love of a good grower = good smoke
back to the seeds. the plant that was riddled with seeds was probably your hermie. the plants that only had seeds in certain parts are probably females that got hermie pollen on only those certain parts (keep in mind, it's possible to only pollinate 1 branch, and leave the rest of the plant as seedless)
we learn with every grow, congrats on this success, and good luck on your next one!
phil!