Now that Hashem had warned him not to speak with Yakov good or bad, why did he continue to chase him?
Oznayim la'Torah: He still had in mind to kill Yakov, and caught up with him, in the hope that Hashem would change his mind and allow him to do so. 1
Why didn't the Torah specify on which mountain Yakov pitched his tent?
Bechor Shor: The Torah revealed that Lavan pitched in Har ha'Gil'ad, and the same applies to Yakov.
Who were Lavan's "brothers" that he stuck in Har ha'Gilad?
Refer to 31:23:1:1,2,3.