Ozymandias

The flashback of Walt and Jesse at the beginning of the episode was the final scene that was shot for the series.

When the shooting first starts, Walt dives down in the back seat towards the floor and his glasses fall off. After the shooting stops and Jack begins talking to Hank, Walt appears in the back window of the SUV with his glasses on. With his hands cuffed behind his back, there is no way he could have retrieved and put on his glasses back on.

When the opening credits begin after the first commercial break, the names of the first three actors appear in the normal sequence with normal timing. At the moment when the name Dean Norris would normally appear, the camera shows Walt looking at his own reflection in the rear view mirror. The name does not appear, and Walt turns the mirror to the side. The camera focuses in on the mirror's new reflection, an empty spot in the New Mexican desert. We then see Walt pause for several moments. Finally, as Walt begins to move on, the name Dean Norris appears on the screen.

Edited from Breaking Bad: Pilot (2008)