1000 - Duboce Park
Wrong address, the park can not have the number 585. This number belongs to a building across the street. Here is a link confirming this:
On the side of the park are the even house numbers. 600 Duboce Avenue would be a gracious address for the park. Or Duboce Ave And Noe St like here : https://www.yelp.com/biz/duboce-park-san-francisco
500 - Museum of Communism
Address incomplete, existing address also wrong. Homepage is missing, phone number is missing. Here are two links to check.
50 - National Museum, Prague
The POI is at the National Museum but has the address of the New National Museum across the street. These are two museums.
Wrong position and wrong address.
The address belongs to a hotel. The link shows this:
At the indicated position is not the described POI. The building belongs to AIRCRAFTTECH, S.L.
Skydive Empuriabrava is located further southeast. Here are two links:
Saltamos Village describes the point of itself with this address:
Barcelona Aerodrome - Bages 08272 Sant Fruitos de Bages Barcelona.
But at this POI a highway(Eix Transversal) is given as an address.
That makes no sense since the highway is 140km long.
Also, there is no exit at the airport from the highway as you can see well at street view. (Satelit a bit unclear)
The airport is very easy to find.
There are also signs in the city for the airport which indicate the way. Here is a link:
The airport also has an address and GPS coordinates.