No shit, Sherlock?

Furthermore, there was a plot hole in Inception. The hero said it was possible to bury a memory at a lower dream level so that the person whose dream it was would wake up believing it, and he knew because he'd done it. But he hadn't. What he'd done was altered something at the dream level and made the person believe it at that dream level, which is the equivalent of winning an argument on the conscious level - nothing like crossing levels.

Oh, so that was a strain on your credibility?

Not only that, it was a straight steal from an episode of Don Rosa's The Life and Times of Scrooge McDuck.
Which I see has been noticed before....

I preferred Dark City.