1)
Why did Yosef's brothers fall in front of him?
1.
Ha'amek Davar: They did not understand his crying. They thought that he cries due to remembering his previous affliction - how is it possible to pardon this?!
2)
Why did they offer to be slaves?
1.
Ha'amek Davar: They thought that he ponders how to sell them to be slaves. They said, you need not ponder how to return our evil - we agree to be slaves to you, and you have vengeance!
3)
Why is there a Dagesh in the second Nun in "Hinenu"?
1.
Ha'amek Davar: Refer to 44:16:153:1.