During the Car Chase scene after the guy on the motorcyle cause Bullitt (McQueen) to go skidding into the dirt, watch closely as McQueen catches up to the charger and you will notice that the scenery is a road between two hills. Easy Enough. But when it shows the passenger in the charger loading the shotgun out the window you see he is on what looks to be a cliff side road over looking the city. When it cuts to Mcqueen and the mustang they are back on the road between the hills, and then back again to the charger over looking the city