Why did Ya'akov's gift comprise a little of this and a little of that?
Seforno: When sending a gift to someone who cannot obtain enough, one sends something big and in large quantities. 1 But when the recipient is a generous person who lacks nothing, one goes for quality rather than quantity, and sends things that are more rare and expensive in small quantities.
Seforno: Such as the gift that Ya'akov sent Eisav.
Seeing as the gift was basically uncalled for, what deeper reason might Ya'akov have had for instructing his sons to give a gift to Yosef?
Seforno #1: Before going in to see Yosef, they would be able to determine his attitude towards them, and thereby know what to say when he confronted them. 1
Seforno #2 (in Pasuk 13): It will also serve as a sort of atonement that goes ahead of you. 2
What are "Botnim"?
Rashi: Pistachio nuts. 1
According to Targum Yonasan, Ya'akov sent (not pistachios and almonds, but) pistachio-oil and almond-oil.
Why did Ya'akov accept Yehudah's offer but not that of Reuven?
Avos de'R. Nasan: Refer to 42:38:1:5.
רש"י: לשון יתר הוא: למה פירש רש"י כך?
גור אריה: היה צריך לכתוב 'אם כן זאת עשו', וה"אפוא" מיותר ולתקון הלשון.
רש"י: שהכל מזמרים עליו: אולי "זמרת" מלשון קצירה- דבר שנקצר מהארץ?
גור אריה: כל דבר נקצר [-גם גידולים פשוטים] ומנחה באה רק מהמשובח.