1:1 "The Lord stirred up the spirit of Cyrus". The Angel  acted directly on his heart (or on his guardian Angel?).

It is significant that Ezra and Nehemiah speak of the "God of Heaven" (e.g. Ezra 1:2) whilst Zechariah speaks of the "God of the earth" or 'land' of Israel, perhaps because the Angel of Israel literally went to Heaven when the glory departed from Jerusalem, and returned, in a sense, at the restoration- to depart again  at Christ's death ("Your house is left unto you desolate"; of the Angel that once dwelt in the temple).

1:8 Sheshbazzar - see on Jer. 23:5

4:24- see on Zech. 3:1

5:1- see on Hag. 1:2

5:5 "The eye of their God (the Angel) was upon the elders of the Jews, that they could not cause them to cease" (building).

They separated / purged, and then, within a few years, we read of them doing so again. Initially, the exiles separated from the peoples of the land (Ezra 6:21); by 9:1 they are in need of separating again; and by 10:11 likewise; then they separate (10:16), only to need another call to separation by the time of Neh. 9:2; 13:3. They obviously found it extremely difficult to be separated from the surrounding world unto God’s law (Neh. 10:28).

6: 22 "The Lord had made them (Israel) joyful, and turned the heart of the king of Assyria unto them, to strengthen their hands in the work of the house of God, the God of Israel" (the God of Jacob- an Angelic term for the Angel that stands for Israel). Note the emphasis on the Angel directly working on human hearts.