Other mistake: In the scene where Peter and Lincoln are driving to question Daniel Hicks, a crew member is playing a practical joke that was somehow missed in editing. If you look at the left side of Lincoln's face, someone is hitting him with a laser pointer. This is definitely not part of the script (i.e. Sniper rifle scope), as no one is actively targeting members of Fringe in this part of the show. (00:16:20)
Fringe (2008)
1 other mistake in Nothing as It Seems - chronological order
Starring: Joshua Jackson, John Noble, Anna Torv, Jasika Nicole
Continuity mistake: The bullet hole in Davidson's chest is not at all where he was shot.
Olivia Dunham: I just want to go back to before.
Phillip Broyles: Dunham, I don't think you can.
The Arrival - S1-E4
Trivia: Michael Cerveris makes his first significant appearance in this episode as The Observer/Bald Man. However if you watch the series from the beginning, he makes fleeting appearances in every episode, sometimes on a tv screen.
Question: Why would Luke Dempsey be arrested along with his father? He had no idea what his father was doing, never aided him in any way and only found out the truth after catching him in the act.
Answer: He helped his father evade capture, impeding the investigation.