I know these issues are addressed in seforim but they really jumped out at me this week as I did shnayim mikra and I didn't have time to look them up.
1) Levushim: It just keeps coming up. Yaakov gives Yosef a special levush. The brothers remove Yosef's levush. They dip the levush in blood and show it to their father as their preferred means of communicating Yosef's "death." In Mitzrayim, Yosef leaves his levush with Eishes Potifar. Yosef is put in a new levush when he is removed from prison. Yosef is dressed in a new levush when he is appointed as mishne l'melech. The question isn't necessarily why these things happened. Rather, the question is why the Torah places so much emphasis on levushim in the story of Yosef.
2) Who bought Yosef Initially: Superficially, the Torah's inconsistency with regard to who initially bought/transported/subsequently sold Yosef is troubling. As I reviewed the story, the inconsistencies became less troubling and more mysterious as I realized that the numerous seemingly gratuitous references to who played which part in the sale/transport/resale of Yosef are far to spread out and "unnecessary" to be "coincidental." The inconsistencies are so pervasive and gratuitous that the repeated references are clearly purposeful. I just don't know what the purpose is.
Maybe I'll find some answers over Shabbos!