Or HaChaim on Genesis 41:32/אור החיים על בראשית מ״א:ל״ב

1 ועל השנות, "concerning the repetition, etc." Joseph alluded to two things. 1) the actual repetition; 2) the minor changes in the second half of the dream, i.e. the fact that the second part did not feature cows. Had both parts of the dream featured cows, Pharaoh might have thought that the impression made upon him by the first dream had caused him to lie down a second time. The reason for the way in which Pharaoh had dreamt the dream was that G'd wanted to show him that all this would begin to happen almost immediately. Pharaoh was not to think that the very change of venue, i.e. ears of corn instead of cows, indicated that the dream was meaningless as a vision of the future.

2וממהר האלוקים לעשותו, "and G'd will carry this out promptly." Joseph deduced this from the two parts of the dream both being dreamt during the same night instead of during consecutive nights.