Please rename relation/340509 to Corrales del Vino as referenced by Wikipedia and Eurostat. Corralles is not unique and the Wikipedia link links to a disambiguation page.

Trying to get a route from Ancona to Zadar, the ferry is shown in the map, but not recognized by OSRM (www.openstreetmap.org/directions). In result, the direction is some 800km on the road instead of using the existing ferry.

According to all statistical sources, Tukums (OSM relation/1837754) is part of Tukuma novads (1781264). i.e. Eurostat LV007-0900200, but also Latvian office of statistics and Wikipedia at https://en.wikipedia.org/wiki/Administrative_divisions_of_Latvia, 99 Tukums Municipality

Please DELETE OSM relation/5822168:
5822168 (Parves-et-Nattages) is obvious duplicate of 5827513 as admin-level 8. Keep 5827513 which includes reference to INSEE, important for mapping INSEE or Eurostats data fields to the proper relation.

According to Wikipedia (and confirmed by recent national statistics update) Pigniu should have been merged with Castrisch, Ilanz, Ladir, Luven, Pitasch, Riein, Ruschein, Schnaus, Sevgein, Duvin, Rueun and Siat into Ilanz/Glion, but seems to have been forgotten. It would be nice if the level 8 boundary relation/1684129 could be merged into relation/3411942.
http://en.wikipedia.org/wiki/Ilanz/Glion

relation/533596 de.wikipedia.org is "Steinen (Westerwald)", not just Steinen.

The Isle of Scilly routing doesn't work properly. OSM shows a 0-drivetime in Lands End with the markers properly placed
osm.org/directions?engine=osrm_car&route=49.91300%2C-6.29200%3B49.95200%2C-6.35900#map=12/49.9258/-6.1719
Zoom out and you will find the markers on the islands some 30/40 km off the "route".
Interesting side effect: It's not providing an error, just a "Zero" drivetime and a map totally offset.

Fahrtzeitberechnung funktioniert in Helgoland nicht, aber statt eines logisch zu erwartenden Fehlers zeigt OSM Routing eine Nullzeit in St. Peter-Ording an: osm.org/directions?engine=osrm_car&route=54.18006%2C7.88736%3B54.18725%2C7.91464#map=19/54.31401/8.60390
Ich schätze dies liegt an Einstellungen der Straßen/Fähren in Helgoland, aber die Anzeige in St. Peter-Ording ist definitiv falsch. Hier wäre eine Fehlermeldung "Strecke nicht gefunden" oder ähnlich richtiger.
Nebenresultat: Sowohl Mapzen (Fehler) als auch Graphhopper (timeout) finden für Fußwege und mit Fahrrad nichts, was ebenfalls falsch ist und wohl an den Basisdaten liegt(?).

osm.org/directions doesn't compute the ferries to England, such resulting in major detour via France (Saint Malo-Cherbourg) i.e. to Dorchester.
Please attach ferries properly to roads.

node/777998160 duplicate node in relation/41513 (Opi) and way outside the relation (~50km)