[out:xml][timeout:3600]; ( way(195493139)['wikipedia'='en:Mildura Senior College']; ); (._;>;); out meta qt;//['wikipedia tag links to 404']
[out:xml][timeout:3600]; ( way(1199667799)['wikidata'='Q1142936']; ); (._;>;); out meta qt;//['should use a secondary wikipedia tag - linking from wikipedia and wikidata tag to a postal service']
[out:xml][timeout:3600]; ( node(11459313437)['wikipedia'='en:Redeemed Christian Church of God']; ); (._;>;); out meta qt;//['should use a secondary wikipedia tag - linking from wikipedia tag to a religious denomination']
[out:xml][timeout:3600]; ( relation(2673170)['wikidata'='Q21898265']['wikipedia'='en:Venus Bay, Victoria']; relation(5964380)['wikidata'='Q114002371']['wikipedia'='en:Melbourne tram route 3']; way(23445079)['wikidata'='Q21958770']['wikipedia'='en:Yallourn Power Station']; ); (._;>;); out meta qt;//['wikipedia wikidata mismatch']
[out:xml][timeout:3600]; ( node(11634111553)['information'='board']['wikipedia'='en:Parks Victoria']; ); (._;>;); out meta qt;//['information board with wikipedia tag, not subject:wikipedia']
[out:xml][timeout:3600]; ( node(11355339612)['information'='board']['wikidata'='Q16927360']; ); (._;>;); out meta qt;//['information board with wikidata tag, not subject:wikidata']
[out:xml][timeout:3600]; ( node(11655806647)['not:operator:wikidata'='Q721162']['operator:wikidata'='Q721162']; node(8421446711)['brand:wikidata'='Q117157352']['not:brand:wikidata'='Q117157352']; node(997415433)['brand:wikidata'='Q4887077']['not:brand:wikidata'='Q4887077']; node(997415434)['brand:wikidata'='Q285328']['not:brand:wikidata'='Q285328']; ); (._;>;); out meta qt;//['wikipedia/wikidata type tag that is incorrect according to not:* tag']
[out:xml][timeout:3600]; ( node(10762356862)['model:wikipedia'='https://en.wikipedia.org/wiki/Centurion_(tank)']; node(10763067277)['model:wikipedia'='https://en.wikipedia.org/wiki/7.7_cm_FK_96_n.A.']; ); (._;>;); out meta qt;//['malformed secondary wikipedia tag - for model prefixed tags']
[out:xml][timeout:3600]; ( node(10763042145)['manufacturer:wikipedia'='https://en.wikipedia.org/wiki/Bofors']; node(10763067276)['manufacturer:wikipedia'='https://en.wikipedia.org/wiki/Krupp']; node(6298940273)['manufacturer:wikipedia'='https://en.wikipedia.org/wiki/Bell_Textron']; ); (._;>;); out meta qt;//['malformed secondary wikipedia tag - for manufacturer prefixed tags']
[out:xml][timeout:3600]; ( way(224632112)['operator:wikidata'='Q115706174']['operator:wikipedia'='en:City of Maroondah']; way(32742446)['operator:wikidata'='Q607272']['operator:wikipedia'='en:Woolworths Supermarkets']; ); (._;>;); out meta qt;//['wikipedia wikidata mismatch - 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.