Why does God destroy Sodom and Gomorrah without warning, but offer Nineveh a chance to repent? The men who come to Lot's house could have just easily prophesied to the people of Sodom and Gomorrah ...
Sefer Yona 4:11 reads: וַאֲנִי לֹא אָחוּס עַל נִינְוֵה הָעִיר הַגְּדוֹלָה אֲשֶׁר יֶשׁ בָּהּ הַרְבֵּה מִשְׁתֵּים עֶשְׂרֵה רִבּוֹ אָדָם אֲשֶׁר לֹא יָדַע בֵּין יְמִינוֹ לִשְׂמֹאלוֹ וּבְהֵמָה רַבָּה ...
In Yona 3:7-8 we find that the people of Ninveh included the animals in their teshuva process. Why make the animals fast and don sackcloth? How was this part of the teshuva process?
In Sefer Yona 3:4 why was it so easy to convince the city of Ninveh to do teshuva (5 words!) if they were so evil?
What's the deal with Yona being swallowed by a fish (2:1)? Couldn't the same thing (i.e. him realizing his mistake) be achieved if he landed on an island?
Why do we read Yona of all things on Yom Kippur? There are better tales of teshuvah that are more relevant to klall yisroel; why was this sefer, which deals exclusively with non-Jews doing teshuva, ...
Sefer Yona 1:2 Why does Hashem send Yona to tell non-Jews to do teshuva (repentance)? I don't believe this was ever done before or since.