<P> Spielberg lobbied to have Dennis Weaver in the starring role because he admired Weaver's work in Orson Welles' Touch of Evil . Weaver repeats one of his lines from Touch of Evil, telling the truck driver in the cafe that he has "another think coming ." This phrase is commonly misstated as "another thing coming", as Weaver's character did in Touch of Evil . </P> <P> In the Archive of American Television website, Spielberg is quoted in an interview given by Weaver as saying: "You know, I watch that movie at least twice a year to remember what I did". </P> <P> Matheson's script made explicit that the unnamed truck driver, the villain of the film, is unseen aside from the shots of his arms and boots that were needed to convey the plot . In the DVD documentary, Spielberg observes that the fear of the unknown is perhaps the greatest fear of all and that Duel plays heavily to that fear . Throughout the film, the driver of the truck remains anonymous and unseen, with the exception of two separate shots where his arm waves Weaver on into oncoming traffic, and another shot where Weaver observes the driver's snakeskin boots . His motives for targeting Weaver's character are never revealed . Spielberg says that the effect of not seeing the driver makes the real villain of the film the truck itself, rather than the driver . </P> <P> The car was carefully chosen, a red Plymouth Valiant, although three cars were used in the actual production of the movie . The original release of Duel featured a 1970 model with a 318 V - 8 engine and "Plymouth" spelled out in block letters across the hood, as well as trunk lid treatment characteristic of the 1970 model; a 1971 model with a 225 Slant Six was also used . When the film was released in theaters and scenes were added, a 1972 model with a 225 Slant Six was added, with the "Plymouth" name on the hood as one emblem . </P>

Who was driving the truck in the movie duel