In the desert, the first long shot shows Hastings in the car wearing the straw hat. In the closeups he is not wearing the hat. When they arrive at the shack, he obtains the straw hat from inside the shack.
The number on Mannix's phone is area code (311) 555-2368. This same number was seen on an office phone at Intertect, several pay phones, and other phones in prior weeks. There is no such area code as 311 in the Los Angeles area.