When it is noted that ‘some of the scribes’ reacted positively, it is likely that they were not Sadducees, who would be less inclined to voice approval for the Lord’s wise rebuttal. Rather, these scribes might have been Pharisees who, while having attempted to challenge the Lord alongside the Sadducees, found some satisfaction in witnessing their rivals being disproven. As recorded in Matthew 22:34 and following verses, after a scribe acknowledged that the Lord had effectively answered the Sadducees, he openly commended Him subsequently (Mark 12:32). This commendation may concern the same scribe along with others of similar thought, as Luke recounts that after the Lord addressed the Sadducees, they said, ‘Master, you have spoken well.’ The Lord's adept scripting of the resurrection of the dead from the Scriptures was so convincing that even His adversaries honored Him on this occasion (Luke 20:40-44).
As for the Lord's inquiry about the Messiah's lineage—His identity as His Son—Luke presents this aspect consistently with the accounts of Matthew and Mark. For reference, see Matthew 22:41-46 and Mark 12:35-37. After the Sadducees were confounded, no one dared to question Him further, as noted by both Matthew and Mark, who report that a scribe sought clarification regarding the greatest commandment in the law (Matthew 22:35-40, Mark 12:28-34). Luke, however, does not include the exchange between the Lord and the scribe concerning the commandment, emphasizing instead that the inquiry about Christ's identity was initiated by the Lord Himself. Consequently, Luke highlights that they refrained from further questioning Him, placing this observation after the Lord’s response to the Sadducees about the resurrection.
Regarding the phrase ‘How then is He Son unto him?’ Luke does not elaborate on the impact of the Lord's question on the audience, but this gap is addressed by Matthew and Mark; Matthew states that no one could provide an answer, while Mark notes that the crowd was attentive and delighted by His teachings.