But one flaw
This movie is so close to being perfect... Imagine how strong and convincing it would have been if they'd just used the dialect of Aalst (and Ghent for Pas's character). To this day, Aalst has one of the most recognisable dialects in Flanders. Yet in this film everyone speaks "proper Dutch".
Watch a Ken Loach movie, and you'll have to agree that it helps set the atmosphere and adds to the authenticity and credibility.