13. Not a chiyuv like Kriyas HaTorah. Some say laining the haftara is not as great a chiyuv as Kriyas HaTorah. Thus, although one may not even speak words of halacha once the sefer Torah is open, one may speak about halacha or the parsha after Kriyas HaTorah. That is why it is called “haftara,” related to the phrase “יפטירו בשפה” [opening the lips] (לבוש ס''א בשם אבודרהם בשם ר''ת, תשב''ץ ח''א סי' קל''א).
14. Chiyuv like Kriyas HaTorah. However, many poskim hold that the chiyuv of haftara is akin to the chiyuv of Kriyas HaTorah, and just like for Kriyas HaTorah, one may not speak until the maftir finishes laining from the Navi (רבינו ירוחם נ''ב, שו''ע קמו ס''ג, מ''ב רפד סקי''ב).
15. Different trop. The reason the tune for the trop is different than that of Kriyas HaTorah is to show that the chiyuv and institution of the haftara is not exactly the same as Kriyas HaTorah; it is on a somewhat lower level.
