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Autoreleased objects are one case where checking -retainCount is uninformative and potentially misleading. The retain count tells you nothing about how many times -autorelease has been called on an object and therefore how many time it will be released when the current autorelease pool drains.
Take a look at the Apple documentation on NSObject, it pretty much covers your question: NSObject retainCount
In short, retainCount is probably useless to you unless you've implemented your own reference counting system (and I can almost guarantee you won't have).
In Apple's own words, retainCount is "typically of no value in debugging memory management issues".