Factual error: Bunny bites an aluminum beer can in half. Beer cans weren't aluminum until the mid 70s. He would have hurt his mouth on that one.
Factual error: Several distinct loon calls are added in the background for about 30 seconds, along with the pipes and other bird calls. Loons are native to Northern America only, and don't exist in Southeast Asia. (00:44:45)
Factual error: At the end of the film in a scene when Bravo Company is defending after a VC attack the company commander (Dale Dye) is wearing second generation ALICE Y-type pistol belt suspenders, which were not introduced until 1970, while the film is set in 1967.