Great sites
Continuity: 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.
Deliberate "mistake": Sam, and not the man he leaps into, somehow fathers a daughter with Abigail. Al and Ziggy's answer to "How?" is "We just don't know." Since Sam has always leaped into the physical body of his subjects with no trace of his own physical presence (yes, we see Sam, but no one else does), fathering a child with his own DNA should be impossible. And the characters acknowledging the "mystery" does not excuse the breach of previously established series canon: it merely makes this, at the very least, a deliberate mistake.
Factual error: Sam leaps into Marilyn Monroe's chauffeur in April, 1960. But the car he's driving her around in is a 1961 Lincoln Continental convertible. The 1960 had prominent tail fins, the redesigned '61 did not, so the difference is noticeable. This is a model Marilyn could not have purchased until, at the earliest, September of 1960.






