1) Happiness is not as subjective as people think. Research suggest that what people state about their own happiness correlates very well with how friends and colleagues would describe a person as.

2) Having lived abroad extensively and traveled around many places keenly trying to observe these things I'd say Norwegian happiness is real. But we have a tendency in Norway to take every good thing for granted and complain a lot. E.g. I noticed when in North American, despite equal wealth, there is a lot more hardship and stress. You can even tell just by looking at people. People are stressed out about over demanding jobs, risk of losing health care, crime, dysfunctional politics etc.

We Norwegians have among the best work-life balances of anywhere. Works doesn't stress people out as much as many other places. And the government provided welfare services means we worry a lot less about stuff than people in the rest of the world.

3) Another thing I notice is that people trust each other to a high level in Norway. In many other parts of the world suspicion and trust grinds on people. It can imagine it is exaushting dealing with a constant paranoia where other people, the government, the police etc can never be trusted.