A lot of the movie's action was filmed at the Washington and Davis Streets junction, the central hub of the Produce District. Let's take a look at the businesses on each corner of the junction, as seen in the movie. Click here to see a map.
1. Southeast Corner
Mike Figlia's business was on the southeast corner (actually the Half Moon Fruit and Produce business) and was seen earlier in the movie - click here to see it.
2. Southwest corner
Then ... The view looks west along Washington across Davis, with Mike Figlia's partly visible at far left. Opposite, on the southwest corner of the junction, is the John DeMartini Produce Co. Further down Davis, Ceylon Street tees in between DeMartini and the taller hotel next to it.
... and Now, the concrete -walled Golden Gateway Garage occupies this corner, in the shadow of the Alcoa Building next to it.
3. Northwest corner
Then ... A. Levy and J. Zentner Co. was on this corner. Once a significant tree-fruit produce distributor in the Central Valley, Levy & Zentner has in the last few years channeled most of its resources into beer distribution.
... from 1945 ... this archival photo shows the same view north along Davis from Washington. Traffic chaos prevailed as usual, especially when the E Union streetcar rolled by.
... and Now, a retail - residential building borders this block of Davis, now closed to through traffic.
4. Northeast corner
Then ... Kitty corner from the John DeMartini building on the southwest corner was another John DeMartini building, in the background below.
... from the 1950s ... this archival photo shows a better view of the same building.
... and Now, this corner is part of the Gateway Apartments and Townhomes.
After Parry recovers from his plastic surgery in Irene's apartment, she removes his bandages and gets to see his new (Bogart's) face. But he doesn't want to put her at risk and decides it's best to get out of her life. He calls for a cab and tells the driver "Post and Fillmore" - the cab drops him off at Harry's Wagon, a railcar-styled diner sandwiched between two buildings.
Then ... These ad hoc diners were popular at that time. Diner researcher Richard Gutman in his informative comment below explains that this particular one began life not as a rail car but as a purpose-built horse-drawn street food wagon in the early 1900s.
... from the 1947 street directory ... the entry below confirms that Harry's Wagon was indeed a real diner at 1921 Post Street near Fillmore (map).
... and Now, Sohn's French Cleaners currently occupies the setback building on the site of the old diner, re-addressed as 1919 Post Street.
... a similar diner ... Harry's Wagon is long gone but thanks to reader Zach Georgopoulos (see his comment below) we now know where we can still dine today in an similar railcar, the Grubstake, at 1525 Pine Street, which according to their website was a converted railcar from the long extinct Key Line railroard system.
A suspicious detective apprehends Parry in the diner but he gives him the slip and takes off (below).
Then ... Madeleine leads Scottie across town to the art gallery at the Palace of the Legion of Honor (map). This grand edifice, at the top of Lincoln Park, was a gift to the city from Alma de Bretteville Spreckels and was completed in 1924. (Trivia note - Alma lived in the Spreckels Mansion, site of one of the murders in the movie The Sniper). The Palace is a 3/4 scale model of the Palais de la Legion d'Honneur in Paris.
... and Now, just the same.
Then ... Scottie finds Madeleine gazing at a portrait in Gallery 6 of the museum. He calls over an attendant who tells him it's a portrait of Carlotta Valdes.
He sneaks up behind her to get a closer look. Not surprisingly the portrait of Carlotta is not on display in the gallery but the two paintings behind Scottie (below) are periodically hung in the adjacent Gallery 7. They are 'Portrait of a Gentleman' by Nicolas de Largilliere' and 'Allegories of the Arts: Architecture' by Charles-Andre van Loo.
Then ... Madeleine is transfixed by the image of Carlotta. The portrait was painted for the movie by studio artist John Ferren but has since been lost.
... and Now, taken from the same spot in Gallery 6.
Scottie realizes that Madeleine's bouquet is the same as Carlotta's in the painting and that her hair is worn in the same style. Spooky.
Madeleine leaves the cemetery and continues on her 'wanderings'. Scottie follows again - this time she leads him to the Palace of the Legion of Honor in Lincoln Park. Every block traversed is listed and described sequentially. An asterisk (*) indicates a route discontinuity, ie a location jump.