Looked like it to me as well. Did you note the type of Graffiti?
For the most part the images weren't that good. Strangely, in the Google street views, there were very few people on the sidewalks, even though the curbside parking was pretty much full in front of the various stores and shops.
So no, I didn't note the Graffiti.There is some on the building to the right of the apartment building where the killer holed up, and where the second two officers were shot. Means nothing to me though.
Try going to Google Maps, and put in the address:
2766 74th Ave, Oakland, CA
Rotate the image until you can see the building to the right of the apartment, the little "N" will be just left of the top of it's circle. Then hit the "+" to zoom in on the graffiti.