Corrected entry: In the scene where Guy's family is watching the Wonders on TV, they are using a wireless remote control to adjust the TV. The film is supposed to take place in 1964, but wireless remote controls for televisions were not available until the 1970s.
Rlvlk
3rd Aug 2008
Correction: Actually, wireless remotes were introduced in 1956. http://www.ideafinder.com/history/inventions/remotectl.htm.
Rlvlk