[out:xml][timeout:3600]; ( way(581309703)['wikidata'='Q25438645']['wikipedia'='no:Smådøla kraftverk']; ); (._;>;); out meta qt;//['wikipedia wikidata mismatch']
[out:xml][timeout:3600]; ( node(5908072720)['information'='board']['wikipedia'='no:Oppistun Børli']; ); (._;>;); out meta qt;//['information board with wikipedia tag, not subject:wikipedia']
JOSM Wikipedia plugin
Note to self: online version hosted at https://matkoniecz.github.io/OSM-wikipedia-tag-validator-reports, files are stored at https://github.com/matkoniecz/OSM-wikipedia-tag-validator-reports.