Rashi on Genesis 40:4/רש"י על בראשית מ׳:ד׳

1ויפקד שר הטבחים את יוסף AND THE OFFICER OF THE EXECUTIONERS APPOINTED JOSEPH — to be WITH THEM (i.e. supply the word להיות to complete the sense).

2ויהיו ימים במשמר AND THEY WERE A YEAR IN WARD — ימים means twelve months (cf. Rashi on Genesis 24:55).