As a Dane I do have some comments for the episodes in Denmark in season 19:
I just spent an hour NOT finding a match. I had figured it was part of an old private residence, but didn't think about the royal residences! 
It is not our royal castle - Amalienborg
http://goo.gl/szIeJhttp://goo.gl/fK1u0And as you can see it is very close to Havet (the pitstop)
http://goo.gl/F5n9XBut it is the castle with out parliament - Christiansborg
http://goo.gl/RYinJhttp://goo.gl/vYXRpAnd the guy in top hat might be our next Don Giovanni 
Sorry he was so dull.
They could take a train to Billund. I once did this route myself & it's not too far & the trains were very convenient.
You can't take a train to Billund. You can take the train to Vejle and then a bus from Vejle to Billund.
Did anyone mention this? The Hans Christian Andersen quote was on an "amazing" plaque...
Else it may have been in danish

Another flaw in this episode. When they are driving from Copenhagen to Billund there are a helicopershoot of this bridge:

But it is Öresundsbroen between Denmark and Sweden (the longest combined road and rail bridge in Europe)
http://goo.gl/NsDHjThe are actually passing Storebæltsbroen (The suspension bridge, known as the East Bridge, has the world's third longest main span (1.6 km), and the longest outside of Asia)
http://goo.gl/7JmMWBut it is shurely because that they got a helicopter in Copenhagen and didn't want to fly the 100 km for a picture of the right bridge.
And the Frederiksborg slot will translate into Frederiks castle castle. The first castle is like a stronghold and the second castle is the livingplace for royals. And Frederik is a name. Our crownprince is Frederik X.
The pistop 'Havet' translates into 'The Sea'. So you can't write The Havet. Then it is The The Sea
