Recently a new layer was added, called "doubled places".
With this you can find POIs or amenities that seem to be double mapped by a single node with its tags and additionally with an area often tagged also with "building=yes" and same or similar tags like the single node.
If you enter the KeepRight site, do not be irritated by the many markers that are switched on by default. You can switch off all at once and then activate the error layer that might be interesting for you, especially the newly introduced doubled places.
If you want to verify or correct some errors via the JOSM editor, I can recommend to have the "remote" feature switched on in JOSM's settings. Thus you can easily click the "JOSM" button at each error on Keppright map to work with and have JOSM started in the background.
Feedback about success in bug squashing or failure is appreciated :-)
If you combine two OSM POI objects to one, please pay attention whether there is one of them that will be deleted when the ODbL change is coming. Best way is to use the according licence change plugin within JOSM!!!