 In accordance with the book, John McTiernan (I) (qv)s version of  the Wendols mother was an old woman, which was filmed with veteran  actress Susan Willis (qv). When Michael Crichton (qv) took over  and did the reshoots, it was decided that brutally killing off an  old lady did not reflect very well on the heroes. Crichton decided  after the fact to make her younger, sleeker and tougher. In the  final released film, Wendols mother is played by actress  Kristen Cloke (qv) (uncredited), but the final credits still list  Susan Willis as the Wendols mother (although she is nowhere to be  seen in the final cut).