
The main problem is that the entire island/peninsula I've encircled with red does not exist at all in 1940! This is the Dutch province of Flevoland which only officially exists since 1985. The first citizens of the city of Lelystad shown in the screenshot started arriving in 1967! Work to claim that land from the sea would only start around 1940 but at that time there was nothing but water there (and one very tiny island that wouldn't even show up on a map of this scale). The dike I crossed out with red (Afsluitdijk) did play a part in the defense of the Netherlands, but should be somewhere were I drew the purple lines. Below is a map of the Netherlands in 1940 (which also shows the Dutch defensive lines and airfields).

I'm sure most players won't notice anything since they're not familiar with Dutch topography, but anyone who is will notice it immediately. Now I will cry large salty Dutch tears whenever I will play this map :'(