1)
What is the significance of "Zeh Pisrono" (with which all interpreters seem to open their interpretations)?
1.
Ohr ha'Chayim: Dreams, say Chazal, follow the interpretation of the interpreter. By making this declaration, he empowers the mouth over the mind, so that what he says will come true.
2)
How did Yosef know that the fate of both officers would be decided on the same day?
1.
Ramban #1 (to 40:10) 1 : He assumed that this is what would happen.
2.
Ramban #2 (ibid.): Because they both dreamt on the same night.
1
Refer to 40:10:1:2**.