By the time Convoy was made, Sam Peckinpah's working life was being overshadowed by reported alcoholism and drug addiction. The production hired his longtime friend James Coburn—one of Peckinpah's most trusted collaborators—as a second-unit director. Accounts of the shoot allege that Coburn sometimes directed scenes in Peckinpah's place when the director was impaired by drugs or alcohol. That arrangement would have been especially consequential on a film built around difficult second-unit work: high-speed truck movement, police chases, crashes, desert roads, and pyrotechnic set pieces.
The allegation fits the broader production record, which included a ballooning budget, an eleven-day schedule overrun, and the eventual removal of Peckinpah and editor Garth Craven by EMI Films. However, the specific claim that Coburn took over scenes because Peckinpah was impaired is identified in the source as needing citation, so it remains less firmly documented than the director's reported substance problems and his later firing. It nevertheless became part of Convoy's lore as an example of a major Hollywood production continuing under a director whose health and reliability were increasingly in question.
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