Factual error: When Clark speaks to Jor-El for the first time in the Fortress, Jor-El says "I will have been dead for many thousands of your years..." Fine in theory - Baby Kal-El travelled to Earth at above light speed so time passed differently for him. However, as such, wouldn't Jor-El have seen Earth as it was thousands of years ago? Which also makes there a problem with all the things Kal-El was taught during his voyage to Earth, as Jor-El references Einstein by name, for instance, and he would not have existed at the point when Jor-El sent him to Earth.
Factual error: The movie and events take place in 1958. However, two Fender amplifiers that are used by the band, "Johnny Casino and The Gamblers" are "Silverface" models that were only manufactured between 1967 and 1981.
Factual error: The car Flounder drives is a 1964 model, built beginning late in 1963, but the events of the movie take place in 1962. (00:45:40 - 01:08:25)
Factual error: The movie is set in New York. When Tony Smerko goes up on the roof of the studio to chop down the antenna, there's a green Art Deco building with a clock tower in the background - the Eastern Building, a downtown Los Angeles landmark since the 1930s.
Factual error: Jake takes a huge piece of gold and condenses it down into a small strip. It is then lifted with no difficulty. For the science of the film to work, this would have to be done without losing any of the gold's mass, or they could just get a small piece. As of such, the condensed gold would be just as heavy, if not heavier than in its original form.
Factual error: During the fire scene at night, the water truck has "Vasser" printed on the side. Water in German is spelled "Wasser."
Factual error: The credits roll closes with the caption "San Francisco...seven thousand miles away from Casablanca." San Francisco is less than 6,000 miles away from Casablanca. (00:03:20)
Factual error: At the end of the fight between Pai Chang Tien (the Old Man) and Shu Chin (the fan-wielder), Pai catches his opponent with his pipe on the larynx and strangles him to death. In his death-throes Shu Chin groans until he dies; but with a piece of wood pressing down on his windpipe, he realistically wouldn't be able to make such a pronounced sound. (01:19:10)
Factual error: In the opening, they are playing 'Life in the Fast Lane' by the Eagles, and they do a closeup of the studio turntable playing the last song on an album, but 'Life in the Fast Lane' is the second song on 'Hotel California' - not the last. (00:04:24)
Factual error: In the sixties retro scenes vehicles can be seen that didn't start production until the seventies.