Barry Rubin astutely identifies them, culminating in this (assuming the truth of reports that President Obama will visit the West Bank as well as mainland Israel):
Perhaps most problematic of all, the PA will turn a visit into a minefield for Obama, designing every detail to make it seem the president is visiting (and acknowledging) an independent Palestine. There will be the flag, the honor guard, the playing of the national anthem, the use of the term “Palestine” (rather than Palestinian Authority—what was agreed on at Oslo—or Palestinian National Authority—the term favored by the PA’s leadership).
--Whatever Obama says, no matter how much it might outrage Israel and its supporters, will be deemed insufficient for the Palestinians.