What aroused Yakov's ire against Lavan?
Ramban, Seforno, Ohr ha'Chayim: Initially, Yakov was concerned lest one of his wives or slaves had stolen the Terafim. But when Lavan found nothing, he concluded that Lavan's claim was merely a pretext to search Yakov's belongings - because Lavan suspected him of stealing something of his. 1
Malbim: There are four reasons to chase after a hired hand [who fled]. (a) If the worker sinned against him
What does "Ki Dalakta Acharai" mean?
Tosfos ha'Shalem (35:2): It is like one who pursues, and his heart is burning (Dolek).
Tosfos ha'Shalem (4, citing R. Efrayim): You burned (pursued rapidly like fire) after me.
Why does it say "va'Ya'an Yakov"? (The Torah usually says "va'Yomer" even when one responds.)
Tosfos ha'Shalem (2): Amidst anger, Yakov raised his voice. "Oneh" connotes loudly - "v'Anu ha'Leviyim ...Kol Ram."
What is "va'Yirev b'Lavan"?
Ohr ha'Chayim #1: Amidst anger, Yakov quarreled with Lavan. If not for the anger, he would not have quarreled with him.
Ohr ha'Chayim #2: It is only because it was Lavan that it seemed like a quarrel. Had he said so to someone else, it would not be called a quarrel.
Ohr ha'Chayim: He quarreled with him alone, not in front of others.
Ha'Emek Davar: Normally, it says va'Yirev Es or va'Yirev Im. Here, it says b'Lavan, i.e. due to Lavan's actions (he suspected Yakov and accused him,) Yakov was silent, amidst pain. Lavan then asked to make a Bris of Shalom. This is possible only after rebuke; this drew him to quarrel with Lavan.