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."
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?enter_a_uh
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.