relation/346798 refers to Node Albuñol (1432103050) as admin_centre ... outside the relation.
Suggest 36.795552, -3.267383 as the location of the bus stop in Sorvilán

relation/45458 should be admin level 8, not 9
(see also in https://osm.wno-edv-service.de/boundaries/ Italy (2), Veneto (4), Vicenza (6))
It's also referred to as LAU2 (OSM Italian admin level 8) by Eurostat LAU2 file.

relation/344873
Please rename the municipality name to "Villanueva de Castellón" with Alt-name "Castelló de la Ribera".
Eurostat, INE and Wikipedia refer "Villanueva de Castellón" causing errors when visualizing statistical data using OSM.
https://es.wikipedia.org/wiki/Villanueva_de_Castell%C3%B3n - also (Redirigido desde «Castelló de la Ribera»)

According to https://es.wikipedia.org/wiki/es:Villadecanes, relation/345872 has been renamed since 2010 to "Toral de los Vados", Please adjust as this causes discrepancies when matching to official information. Thank you.

osm.org/directions does not recognize the Malaga-Melilla ferry, resulting in major detour via Motril.

Official name is Foča-Ustikolina, also as per http://www.foca-ustikolina.ba/

relation/2523700 has no language independent naming. Eurocontrol refers Isojoki (name) and Storå (name latin). I recommend to select Isojoki, Storå is referenced in the dataset as language version.

osm.org/directions cannot find the way to use the two ferries...?

relation/3506326 (Podlavice, wrong admin-level 9)

Slovakia (2), Central Slovakia (3), Region of Banská Bystrica (4), District of Banská Bystrica (8), Podlavice (9)
Neither exists in Eurostat LAU2 nor able to access in https://osm.wno-edv-service.de/boundaries/

Possible dupe with 2265272 (admin-level 10): Slovakia (2), Central Slovakia (3), Region of Banská Bystrica (4), District of Banská Bystrica (8), Podlavice (9), Banská Bystrica (9)

Thanks for removing from admin level 9 (sorry, I'm only a user, not a mapper, don't know how)