I had a limit buy order at $45 which I placed at 11am (when it opened) which was never filled (and should have been, as the price never went above $43 or so). There were definite trading glitches, and if they were skewed on the buy side, that could definitely have affected the price.

EDIT: Actually, the order did go through (annoyingly, at $42). The delay was just in the reporting. So never mind.