Corrected entry: It is accepted canon that Al sees Sam as the person he has leapt into, and Sam of course sees Al as Al. Therefore, at the beginning of this episode, Al would have been shocked to see Sam standing next to him, while Sam would not have recognized Al, but rather would be looking at Tom the soldier that Al has leapt into. However, they are unaware of the role reversal until Al walks into the cannon on the lawn.
Corrected entry: At the end of this episode, Sam has leapt into the body of a baseball player and realizes he's there to win the game. Sam swings the bat but misses the ball three times. He should have been struck out, but instead run the bases, winning the game.
Corrected entry: Towards the beginning of the series, it was established that Sam often spent weeks "bouncing" around time before landing in somebody's life to change the past - this transition is seen as instantaneous from Dr. Beckett and the audience's perspective. However, when Dr. Ruth leaps back into her own time at the end, she's instantly replaced by the next person.
Corrected entry: In Good Morning, Peoria (series 2, episode 6), when Sam is creating a makeshift aerial on the roof, Al starts glowing blue, as Sam does when he leaps. He says "Look Sam, I'm leaping." However, in this episode, Sam sees someone else leap. When Al appears, Sam excitedly tells him about it and asks Al if he goes all blue and charged with electricity when he leaps. Al responds by saying that he wouldn't know, as when Sam leaps he simply finds himself back in the imaging chamber. If Al has never seen this why would he have assumed he was leaping in an earlier show?
Corrected entry: 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.
Corrected entry: 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." (00:21:10)
Corrected entry: For those not familiar with the show, a scientist named Sam leaps into peoples' bodies and changes their futures. Us viewers see the person as Sam, but characters in the show still see the person Sam has leapt into. So when Sam leaps into a child or a short person, the other characters should technically be looking at Sam's chest when they are trying to look him in the eyes because that's where their eyes would be. Instead, they always look right into Sam's eyes - too high if you are really talking to a child or short person.