These cycle paths paralleling Arden Way don't seem to exist in reality.

This is almost certainly not named "Polk Street Cycle Track"; that is not terminology that the City & County of SF would use. Most likely this is just part of Polk Street, and some numbered bike route, and could be tagged as cycleway:left=opposite_track or whatever.

The lane count on Folsom Street looks wrong. For most of this stretch through SoMa it's only 3 lanes with a wide green-painted bike lane on the right side. Aerial imagery is out of date.

to do: map bus route 19

Is this "Mark Twain Street" or "Mark Twain Alley"? Also, needs old_name/alt_name=Merchant Street.

new user drew a duplicate Sharon Park on top of existing Sharon Park

Path(s) removed in changeset/52194661, but it looks like access is "discouraged", which is very different from "prohibited", and even if they were to be closed, they still seem to sorta exist, and should still be on the map with the appropriate access and surface tags and not deleted completely.

The park is also missing from the map.

unlikely pokemon-pond. Also the building(s) mapped here have been demolished in Digitalglobe imagery and 2016 Mapillary photos

Pokemon vandalism by @diverp141618