1)
What is the significance of the details mentioned at the end of the Pasuk?
1.
Rashi: It is referring to three different aspects of the Korban: "ba'Erev" - in the afternoon 1 , it is slaughtered; "ke'Vo ha'Shemesh" - at nightfall, it is eaten, and "Mo'ed Tzeischa mi'Mitzrayim" - when you left Egypt (on the morning of the fifteenth), it becomes Nosar and must be burned. 2
2.
Ramban #1 (in Pasuk 4): "Sham Tizbach es ha'Pesach ba'Erev" refers to eating the Pesach during the night. 3