QIn the U.S. version during the pre-credit sequence, Candy is driving the bus, but in releases in other parts of the world (England, Sweden, Germany, and others), different girls get to drive. Why?
ADuring the making of the film (under the title "The Candy Web"), William Castle held a contest in 13 different countries. The winner in each country would have an opportunity to appear in the film as a Teenage Diplomat (and credited as so), representing their country. One of the perks of winning the contest would be appearing in a part exclusive to the country that winner was from, which would be the sequence of them driving the bus at the beginning of the film. Therefore, the winner from England would be shown driving the bus in prints released in England, the winner from Germany in prints for Germany, and so on. The winner from each country would also introduce the trailer from the film in their country.If you're interested, the England, Sweden, France, and German versions of this sequence is presented as bonus material on the "13 Frightened Girls" disc in the "William Castle Film Collection" box set from Sony Pictures Home Entertainment.