Factual error: It was mentioned the museum has $3 million in gold bars. At 1978 prices, that is about 280 pounds. Gold is fairly heavy and the size of the bar shown in the film looks like 25 pounds. Assuming about 25 pounds per bar, I counted 134 bars or 3,350 pounds or almost $36 million dollars. I guess a big stack of gold bar looks better than a small stack of 11 bars. (00:41:55)
Return from Witch Mountain (1978)
1 factual error - chronological order
Directed by: John Hough
Starring: Christopher Lee, Bette Davis, Kim Richards, Ike Eisenmann
Revealing mistake: When Tony is stacking the wine barrels in Gannon's lab, you can see the wires pulling the last barrel up into the pyramid.
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Answer: In "Escape To Witch Mountain", Tony tells the lady in charge of the children's home that their foster parents adopted them when Tia was 3 and Tony was 5. "Escape" possibly takes place 6 years after they were adopted, making them 9 and 11 in "Escape", and 12 and 14 in "Return".