Why did Lavan say "va'Tignov Osi"?
Bechor Shor #1: Our city agreed that no one may leave without Os Sheli (my Siman). I would have given it to you! One who leaves without it is assumed to be a thief.
Bechor Shor #2: Lavan's money was dear to him like himself. It seemed to him as if Yakov stole Lavan himself.
Malbim: You deprived me of the Simchah of sending you away, and to kiss my daughters. 4. Ha'Emek Davar: He suspected that Yakov stole his Kelim. One who flees suddenly, he does not even take all his Kelim. He saw that Yakov had all his Kelim
Why is b'Shirim written lacking a Yud?
Tosfos ha'Shalem (3): We read it like Sarim (I would have sent nobles to accompany you).