Some interesting things about this passage:
- Verse 9 indicates that Joseph was imprisoned in the house of the captain of the guard. However, this was not just house arrest as we might think of it. Probably the captain lived in a house adjacent to the prison. It was the place where the king's prisoners were kept. (Gen. 39:20) It had a warden and other prisoners. (Gen. 39:21-22).
- Verse 12 confirms that Joseph was a young man when he was imprisoned, and that he was a Hebrew. This was how the cupbearer described Joseph to the Pharaoh.
- Everything which Joseph had predicted came true. (Genesis 40:21-22; Genesis 41:13)
- Joseph was brought to Pharaoh from the dungeon of this prison. (Gen.41:14) Also, see Gen. 40:15, where Joseph claims that he does not deserve to be put in a dungeon.