Most of the Nazi relics in this movie are actual authentic items from World War II.
The crew rescued an abandoned tabby kitten during the filming of this movie that they found under the floorboards of one of the movie sets. They named the kitten 'Toulon' after the main character of the movie.
This movie was in production at the same time as Puppet Master: Axis Termination (2017). The only other time two Puppet Master movies have been in production at the same time was when Puppet Master 4 (1993) & Puppet Master 5 (1994) were being made back-to-back.
The producers have said that this movie takes place in a parallel universe and this is why Andre Toulon is an evil Nazi this time rather than the original movies where he was against the Third Reich.