Ofcourse, the opposite also happens. This has all to do with psycology and be aware of these kind of games. Even already relegated teams can play better after their fate have been decided. The pressure's off, and suddenly they start to play well again. Stay away from these kind of games, they are usually difficult to predict.
Local derbies are alway special.
Pay attention to these games. Derbies do tend to end with a draw, as the fear of loosing exceeds the will to win. The top teams know they can do it all at home in the second leg, and often settle for a dull draw or a minor loss. Do not bother betting at friendlies, either it's internationals, pre-season, testemonials or show matches. It's a waste of money, although international friendlies are easier to predict than other friendlies.