1) Will this family ever learn, the brutal favoritism for Isaac, Jacob, and now Joseph (INCREASE). Think of the complications of the favored son of the favored wife.
2) Important point: instead of seeing Joesph as a brat tattling on his brothers; the grammar permits, indeed leads one, to the reading that the evil report is their gossip and murmurs against Joseph. that is how the word is used in Jeremiah. Joseph is the victim of a campaign against him. This deepens the issue of their being unable to speak peaceably (leshalom) with well-being/health/(healthy regard?) toward him.
3)  the coat may be many-colored, or spangled, or just long-sleeved, but the word is also used about the garment's of royal women. (No, I doubt Jacob had him in women's clothing)
4) Joseph has dreams like his father did. Yet, Jacob rebukes Joseph for a dream that must remind Jacob of his actions toward his elder brother, though twin, Esau. Is the real issue that Jacob may be one bowing? Is this an oedipal conflict too?
5) Joseph is asked to check on the brothers and their welfare (shalom again)
6) Pay attention to Reuben and Judah in birth order and in terms of their action later in the story.
10) See the irony that Ishmael's progeny, he who was disfavored by Abraham, now plays into this larger brotherly struggle-remember Ishmael's mother was an Egyptian slave of Abraham and Sarah.
11) What do you make of Reuben's reaction?
12) The brothers deceive with the robe, just as Jacob deceived his father years before.Note Jacob will grieve all the way down to Sheol. He will change when he goes down to Egypt at the end, but on his way to Sheol. His refusals or inability to be comforted is a good thought for us when we try to place someone's grief on our timetable.