They seem to have played a tough, competitive match.
Besides, if you were Denmark, comfortable in the knowledge that you're 2-1 up and can even afford to concede another goal, wouldn't you slack off just a tiny bit - it's just human nature. Meanwhile, Sweden were desperate to score - they were out if they didn't and Italy found a goal (which they did). I think there's little evidance of a fix. As for their behaviour after the game, they're neighbours, get on well, and were both celebrating qualifying from their group. Simple.