Fringe (2008)

And Those We Left Behind - S4-E6

Plot hole: The very ending scene where Peter (in this version died in the ice as a boy so Walter's wife never met him) takes off some of the dust covers then picks up a toy airplane. The toy airplane he got as a child from ... Walter's wife when she was trying to placate him in an earlier episode for trying to run "home". This toy airplane wouldn't have been his as a child in this version of the universe. (00:42:00)

juarlita

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.

Jeff Walker

Olivia - S3-E1

Question: Why would Olivia be so quick to believe John was a traitor? In one episode, she tells her sister that there were documents and evidence but, the evidence could have been planted and documents can be forged.