Cannes Film Fest 2008 (In Competition)–Dramatically and artistically, Eastwood's period thriller “Changeling,” based on an actual case of injustice that helped bring down a corrupt police and ushered a new era of greater equality, is an enjoyable old-fashioned saga but not as complex or morally ambiguous as his Oscar-winning features, “Mystic River” in 2003 and “Million Dollar Baby” in 2004.