 At the beginning of the game, Pitfall Harry mentions a fellow  explorer named Forrestal who went looking for a Chacopayan idol in  the Peruvian jungle. This is a direct reference to  _Raiders of the Lost Ark (1981)_ (qv), where Indiana Jones mentions  a fellow explorer named Forrestal who was trying to recover the  Chacopayan idol he is after in Peru. The game also makes several  references to "that Jones guy."