Irrespective of any practical applications, the issue in and of itself touches upon a number of important and fundamental principles regarding the laws of chametz and matza...
The "Hallel" that we say during the Pesach Seder has two unique characteristics: First, it is said at night, even though the mishna in Megilla (20b) lists Hallel as something that is recited during the day. Second, we break it up into two parts - we recite the first part of Hallel right before we drink the second cup of wine, and the rest after the meal before drinking the fourth cup.
In the Pesach Hagadda, we recount the story of the five Tanna'im who had a seder together in Bnei Brak. What is the significance of this story, and what were they discussing? This shiur suggests that they were talking about how to apply the lessons of the exodus from Egypt to their own times.
The Seder provides us with a colorful array of mitzvot linked together by the controlling objective of sippur yetziat Mitzrayim - discussing and identifying with the Exodus from Egypt.
The commandment to drink four cups of wine during the seder is rabbinic, as is explained later in the Talmud (109b; 117b): “Our rabbis instituted four cups as symbolizing freedom.”
