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
Starring: Mary Steenburgen, Joe Mantegna, Jason Ritter, Amber Tamblyn
Continuity mistake: When Adam gets angry at Joan in the art room because of the camera, his half-made sculpture is sitting on the desk. When he grabs his bag toward the end of the scene, he accidentally knocks it over, unbalancing it. But in the next shot it's balanced again, then suddenly it's unbalanced. This happens several times between shots, and can even be seen in one shot before he knocks it over.
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.
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Correction: It's a joke.
Myridon