Continuity mistake: In the scene in the courtroom, when Kevin is being questioned by the prosecutor, she introduces several photos of Katie to the judge. The judge keeps two or three of them, and the prosecutor carries one to the witness stand. As she is carrying it to the stand, it can be seen that it is a photo of Katie wearing a dark top, with what appears to be a fluorescent light over Katie's head. The prosecutor then places the photo on the stand for Kevin to view, and it shows Katie wearing a white hospital gown with blue dots. After the prosecutor questions Kevin, the defense attorney walks over to the stand and picks up the photo. This time, it shows Katie in a red v-neck top, with no light above Katie's head. (00:30:35)
Factual error: Al says he was an astronaut and flew around the moon, describing a mission that sounds precisely like Apollo 8 (10 orbits around the moon, reading of Genesis, etc). In the season 2 finale episode 'MIA, ' set in 1969, Al says he was shot down in Vietnam two years earlier, in 1967, taken prisoner and not freed until 1973. The Apollo 8 mission flew in Dec. 1968, meaning Al would have been a POW at the time. Also, NASA astronauts aren't generally sent to serve as pilots in active war zones.
Revealing mistake: When Al jumps into the shot out of nowhere on the steps after the record producer leaves, Sam and the two girls abruptly move, giving away the technique to achieve Al showing up. The transition is usually smoother, this one happens to be rough and noticeable.
Character mistake: When Sam is trying to explain to Al how he feels the person he's leapt into, Jack, is still in his head, Sam asks Al if he remembers how their personalities got mixed up when they simul-leaped. Al says he does not. Three episodes previously, in Permanent Wave, Al asks Sam if there's still some of him, Al, left in Sam because of the way Sam is behaving toward the twins. So Al remembers in one episode, but in another, later episode his brain is somehow still swiss-cheesed from the leap on this particular detail. (02:33:40)
Plot hole: Sam is trapped inside the imaging chamber without a hand-link for the first half of this episode. Yet, somehow, he is still able to follow Al around town. The chamber is only so big. Without the hand-link to recenter himself on Al once he's traveled beyond the walls of the chamber, Sam would have been unable to move much further than the town square he appeared in.