Colonel Light Gardens
In the 'Applying Effects' section the rule says, that 'You may look at any of the face-down cards in front of you at any time', which implies to me, that you can't look the opponents' cards, just your own.
Is this the definitive answer? Technically all cards on the table are in front of you. It would be hard to keep track of things in a 4 or 5 player game!