All the poisonous snakes featured were authentic and the cast actually did have to interact with them for filming. Only in the shot where Strother Martin grabs the King Cobra's head during the show was a puppet snake used.
The poisonous snakes were not defanged during production. Five King Cobras were imported from Thailand for this feature, ranging from 10-15 feet in length. They had been recently caught in the wild and were in good health with full venom capabilities. The "Snake Park" milking scenes were real and meant to mimic what Bill Haast did at his Serpentarium in Florida daily. About one ounce of venom was collected during each take, with no harm to the snakes. A different cobra was used for each take. The filming of this took most of a day, as the cobras spent most of their time trying to escape the fenced enclosure rather than raising up in the traditional cobra attack mode.
During the skinny-dipping scenes, the producers superimposed foliage over the footage to obscure the "naughty bits" of Heather Menzies-Urich and Dirk Benedict, most likely to achieve a PG rating as opposed to an R rating.