Bruce Campbell's cameo role as The Sex Psychiatrist exists because Kevin Neece believed it might be his last chance to include Bruce in the Bad Goddess series due to him never knowing where his next great episode idea is going to come from. Technically Bruce Campbell is playing the same character that Harry Reems played in Deep Throat. The Reason Why Bruce Campbell has not been cast as Doctor What is because Kevin Neece gave that role to Ted Raimi as Doctor What is supposed to be played by the secondary co-star, not the main actor. Ted Raimi is always wingman to Bruce Campbell in his starring role films.
Kevin Neece based this entire movie on a Joke Tweet he made in protest of Elon Musk's Twitter being overrun with Spam Porn from Fans Only. Kevin Neece kept implying that Twitter was secretly being run by Ray Ray from A Dirty Shame and that Elon Musk was his Front Man. In his own defense to the Voice Actresses who worked on the Ah My Goddess anime series, what did they believe such a movie was going to read like once Kevin Neece fleshed out the dialogue discussions on paper.
Mia Khalifa is repeatedly referenced by Ray Ray as a Role Model that all Sex Entertainers should look up to and aspire to. Belldandy warns the viewers at the end of the movie that Mia Khalifa stopped making Hardcore Porn for a reason. According to Mia Khalifa herself, she was beginning to suffer from PTSD due to people undressing her with their eyes when she went out in public. It was making her extremely nervous. Mia Khalifa still makes video responses for her fans online, but when they request she make porn, she jokingly writes XXX on a sheet of paper and refuses to give in to them.
When Sam Rockwell's Justin Hammer cameos from Iron Man 2, the insinuation is that Elon Musk is our Reality's Version of Justin Hammer, who is presented by Jon Favreau as a complete idiot who makes faulty weapons and equipment for the United States Government. Elon Musk looks up to Justin Hammer as an Inspiration to him, but it is not meant to be a compliment in any way. The only reason that Justin Hammer's Advice looks cool in this movie is because Kevin Neece was writing his dialogue. Hence Justin Hammer is still an idiot and Elon Musk is an even bigger idiot for basing his career on him. The Ah My Goddess Universe co-exists within the Marvel Cinematic Universe because the Three Goddesses are sisters to Thor and Loki, their father being Odin. Having pointed that out, Bad Goddess is still meant to look like a Public Access Station Teleplay shot in front of a Green Screen and Justin Hammer is exactly the kind of Second Rate Actor cameo that might appear on a Public Access Show.