The film's hastily added Vietnam prologue was shot over four days at Indian Dunes in Valencia, California, with pyrotechnics coordinator Paul Stewart. The location later became infamous as the site of the 1982 Twilight Zone: The Movie helicopter catastrophe, in which actor Vic Morrow and child performers My-ca Dinh Le and Renee Shin-Yi Chen were killed during the filming of John Landis's Vietnam segment. During the ensuing trial, allegations surfaced that The Exterminator's production had experienced warning signs at the same location—including claims involving a helicopter mishap—and that these incidents foreshadowed the later disaster.
James Glickenhaus categorically denied most of those assertions and supplied Variety with testimonies intended to contradict them. The overlap of location, Vietnam subject matter, and pyrotechnics personnel gave the story an eerie afterlife, but the available account does not establish that The Exterminator suffered the specific sequence of dangerous incidents later alleged. The connection is therefore best treated as a persistent piece of production lore rather than a confirmed precursor to the Twilight Zone tragedy.
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