Seeing as this Pasuk is referring to a Chacham (Rashi in Bo, Shemos 13:14) what exactly is he asking?
Seforno: He is asking why the seven Mitzvos of B'nei No'ach do not suffice.
Ramban: Which commemorate and testify on Hashem's miracles - such as Matzah, Succah, Pesach, Shabbos, Tefilin and Mezuzah.
Ramban: Such as stoning someone who desecrates the Shabbos, burning a man who has relations with a woman and her mother or lashing someone who plants Kil'ayim, as opposed to the Torah's civil laws, such as that of an ox or a pit that damages and the laws of the four kinds of Shomrim, which are righteous and good and easily understood by everybody.
Rashi (Shemos 13:5) writes that Shemos 12:26 discusses an evil son, because he said [that the Avodah is "Lachem" (and not for him). Rashi (Shemos 13:14) writes that our Pasuk refers to a Chacham. Also he said that Hashem commanded "Eschem"!