I always enjoy spotting things like this...where budget over rules accuracy. It makes sense. The original Star Trek communicator knobs where chrome plastic wheels from Aurora HO slot cars.
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Spotting movie mistakes or continuity errors is something I enjoy doing. In the movie "Core" there is a scene where thousands of birds, having lost their ability to navigate due to a collapsing magnetic field, are smashing into storefront windows. The birds look real enough, but are computer generated. Someone in the CA department had a sense of humor because if you watch real close, one of the birds is really peculiar (it's mixed in with hundreds of other birds and is only on screen for a flash):
In the movie "Twister" there is a scene where the pickup truck has it's windshield smashed but a piece of farm equipment, but in the very next scene the windshield has magically healed itself.
Windshield is magically healed next shot (and if you look at the side mirrors you can tell it's not the same truck):
Then, in Mr Smith Goes to Washington, the character "Jim Taylor" is talking to the senator when someone tells him he has a call. Between the time he is talking to the senator and the time he walks over and sits at his desk to take the call, his tie changes.