What did the ben Sorer u'Moreh do to deserve the death-penalty?
Rashi: He is only branded as a ben Sorer u'Moreh if he steals from his parents a Tartimar (a large measure) of meat and half a Log of wine, 1 though that in itself, is not sufficient reason to receive the death-sentence. 2
Ramban #1 (on Pasuk 18): A ben Sorer u'Moreh is Chayav for committing two basic sins: 1. for treating his parents with disrespect and rebelling against them; 2. For transgressing the Mitzvah of "Kedoshim Tih'yu" 3 via his gluttony and drunkenness. 4 - and also for contravening "ve'Oso Sa'avodu u'Bo Sidbakun" 5 , or it is a branch of Kibud Av va'Eim.
Rashi and Ramban (citing Sanhedrin, 71a): Which he only faces because, when he eats up all his father's money, in his quest to maintain his high standard of living, he will inevitably go on to become a highway-robber. The Torah therefore rules that 'It is better that he dies whilst he still innocent than that he dies guilty'.
What are the connotations of "ve'Chol Yisrael Yishm'u Veyira'u"?
Ramban: The Torah inserts this phrase whenever the person is not really deserving of the death-sentence, 1 and he is only being put to death as a warning to the community at large or so that he should not cause others to sin. 2