There seem to be three significant details in this text:
[1] the open way in which Jesus taught. This is contrasted by the “secret” way in which he is arrested
[2] Matthew’s reiteration of the centrality of Jesus as the fulfillment of the Scriptures (here, specifically, the prophets)
[3] the desertion of the disciples.
I think we get [3], but wonder if we have spent sufficient time pondering [1] and [2].