Jiraiya's giant toad was used in another ninja-themed production from Toei, the popular TV series Masked Ninja Akakage (1967), as a monster-of-the-week.
It has long been speculated that this film was one of George Lucas' inspirations for the "Star Wars" series.
The giant spider in the film may been the inspiration for Kumonga from the film som of godzilla (1967). Both shoot webs from their mouth, however the only difference is that the spider is not a marionettes like Kumonga. Instead it is just on a string.