Corrected entry: Joan asks her brother Luke, a physics nerd, to explain the elecromagnetic spectrum to her for an exam. He tells her that everything the eye can see is in the center; molecules, gravity, and things we can't see but can quantify based on their behavior are on the left; and on the right is everything we haven't figured out yet, such as time warps and ghosts. Wrong. There is no scientific scale divided into "things we know" and "things we don't". The electromagnetic spectrum is a range of wave frequencies. We define sound, ultraviolet light, infrared light, visible light, X-rays, and cosmic rays by this spectrum. Gravity is completely different, as are molecules and most of the things mentioned in the scene. Luke, as a physics geek, would absolutely know all this. He would never, ever describe the electromagnetic spectrum the way this scene had him doing.
Joan of Arcadia (2003)
1 corrected entry in show generally
Starring: Mary Steenburgen, Joe Mantegna, Jason Ritter, Amber Tamblyn
Continuity mistake: In the previous episode 'Back to the Garden', Helen asks Joan what she can remember from the night of Kevin's accident and Joan says she was watching The Nutty Professor when she heard her mom scream. In this episode, in one of the flashbacks Joan and Luke are watching The Three Stooges when Helen screams.
Joan: Great, so ask Isaac Newton to the prom.
Luke: Sure, if he was a girl... and alive.
Trivia: When the Girardis are debating over what to watch for movie night, Will suggests one of the Godfather films. Joe Mantegna previously had a supporting role in The Godfather Part III.
Correction: It's a joke.
Myridon