I just can't believe we have not yet published a tutorial for this essential OpenRefine feature!
When you select the edit option from the facet menu, you can edit all matching values in a column, similar to a search and replace function. Of course, the update is recorded in OpenRefine history and can be replicated on a similar dataset.
You can use the edit using facet to quickly clean up typos or misspelled cells. It is also useful to address duplicates that are either not detected by the clustering feature or caught in larger clusters with irrelevant matches.
In this video example below, we replace the value US to United States for 45 cells in one shot.