This is not a "USARK" statement, just mine***
I think a good angle would be to make the focus of the film The HSUS (and possibly other AR orgs but don't want to lose focus). It could expose them for who they really are which of course would hopefully limit their impact on politicians and also impact their funding/donations. A mention of the financial statements and recent pushes by the public to have their IRS tax-exempt status revoked could be huge components in establishing the credibility of The HSUS.
The film could then delve into how their two main purposes are to engage in litigation and legislation. The legislation portion would logically flow to politicians and then to the Anti-Reptile Legislation.
Exposing HSUS backed legislation that targets all segments of the cat and dog industry would be helpful to illustrate that although they haven't come right out and stated they're against keeping cats and dogs, their total effort towards eliminating large scale breeders, eliminating pet store sellers, and enforcing spay and neuter laws for everyone else would end cat and dog ownership in one generation. It would also be helpful to get the "cuddly" pet owners interested as well.
HR669 could be used as an example of broad efforts, and then HR2811 and S373 could be the "building blocks" illustrating what The HSUS is willing to do when broad measures fail.
Possibly end the legislation piece with a simple illustration of a pie regarding "exotic" animals. HR669 was a whole pie. HSUS couldn't eat it all at once. So they tried HR2811/S373, it's just a slice of pie. The others slices are still out there, waiting to be eaten.
I think exposing those who are attacking the entire industry is the way to go. It would hopefully limit attacks on the entire pet industry.
Just my thoughts. Again, NOT USARK's position***