1. It should read, "But Jesus having been born in the days of Herod the king "; this would indeed leave the time purposely vague.
13. It is the present tense, " appears "; see also verse 19 " appears," and chapter 3:1, "comes."
21. Eis gen Israel (into the land of Israel). All the Lord's history here is as of Israel, the manner of deliverance and all, but of Israel fallen, but in verse 22 it meets the detail of ruin as well as knows the hope; gen (land) has no article here, because Israel, the proper name, is the subject. 'Israel' would be a genitive, and the sense different, if it were ten gen Israel. Ten gen ten Israel would not be sense, for separated from gen, and in apposition, Israel is a man's name.