Petulia - Tuba
Then ... Archie gets a call to come pick Petulia up. We see him getting out of his car in this cleverly arranged shot through a stone railing and under a bench. On the back of the bench are two psychedelic posters of Jerry Garcia, pre-beard - the real Jerry will appear in other scenes later in the movie - and the legs of a man sitting on the bench are whimsically aligned with one of the posters.
That poster was printed for a Grateful Dead Concert at the Fillmore Auditorium on October 21 and 22, 1966. Here's the full version ...
... and Now, the same view is through the railing at the top of the Filbert Steps linking the two-level Montgomery Street - incidentally, right in front of Irene's apartment in the movie Dark Passage.
Then ... Petulia still has the tuba she had filched from O'Dell's Pawn Shop earlier that morning (the instrument is referred to as a tuba in the script but reader Karl Gohl points out that it's really a sousaphone, John Philip Sousa's redesign of a tuba).
... and Now, this is the upper level of Montgomery at the top of the linking Filbert steps (map).
Then ... Archie joins her and we can see down Montgomery towards, at the end of the street, Julius' Castle, the iconic 1922 restaurant. The bench in the foreground plastered with the Jerry Garcia posters is the same one shown above.
... and Now, Julius Castle is still there but it closed its doors as recently as January 2009. The Filbert Steps continue up to Coit Tower at far left.
A bus arrives and Petulia climbs in, leaving Archie with a request to return the instrument to its rightful owners, the Companions Of The Evergreen, - " ... it's a lodge on Grant Street" - but as we who care shall see, the lodge was not on Grant at all. What's more, this bus is driving the wrong way down a one-way street and the real-life bus that services Telegraph Hill, the 39 -Coit, doesn't even get this far - it comes up Union Street and makes a U-turn a block away from here.