When Penhall and his girl have dinner with the owners of the house they want to rent, the man offers Penhall a 'Dark German beer'. The lady gives Penhall the bottle, and while Penhall has trouble opening the top of the beer bottle, we can see the beer brand in the close up.
The Signature top and the name are clearly visible, and last time i checked Grolsch was founded in the Netherlands in 1615.
I love the show, and i notice in almost every show, not confused with episode, there are a few writers who don't do their homework and credit the wrong brand, city, state or even a whole country.