[out:xml][timeout:3600]; ( node(10157168215)['wikipedia'='en:Slate Range Crossing, California']; node(150960052)['wikipedia'='en:Linnie, California']; node(150972965)['wikipedia'='en:Brockmans Corner, California']; node(150974659)['wikipedia'='en:Oteys Sierra Village, California']; node(88385890)['wikipedia'='en:Towne Pass, California']; ); (._;>;); out meta qt;//['wikipedia tag links to 404']
[out:xml][timeout:3600]; ( relation(13766670)['wikidata'='Q118779862']['wikipedia'='en:Alabama Hills']; way(96614687)['wikidata'='Q100269287']['wikipedia'='en:Badwater Basin']; ); (._;>;); out meta qt;//['wikipedia wikidata mismatch']
[out:xml][timeout:3600]; ( way(166990906)['operator:wikipedia'='Xanterra_Travel_Collection']; ); (._;>;); out meta qt;//['malformed secondary wikipedia tag - for operator prefixed tags']
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.