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For four seasons, we were told that Al always saw Sam as the person he'd leaped into. (Case in point: Al once suffered an attack of guilt-ridden lust when Sam leaped into a very attractive woman.) Here, that series canon is violated when Al tells Sam, "Nobody sees you except me. Everyone else sees the real Miller." Rationalizations that "Ziggy was reprogrammed and we just weren't told about it" don't suffice. This unexplained change/screw-up in season 5 was one of many poor-choice changes that "jumped the shark" and led to Quantum Leap's ultimate cancellation. See more...
Quantum Leap (1989) - 2 easter eggs
starring Dean Stockwell, Scott Bakula (add more)
Easter eggs are hidden bits on DVDs which if you know where to look can provide all sorts of fun extras.