NOT a $20M movie - Trivia is wrong!
This was a $10M movie (if that part of the trivia is correct, I don't know). But promotional costs are NEVER included in the production costs of a movie - NEVER.
In fact, the promotional costs are ALWAYS borne by the studio and/or distributors as a totally separate cost from the producer's costs to make the actual movie.
If you ever do see promo costs INCLUDED in a production budget, it's an accounting scam of some kind.
I don't know what kind of scam Allan Carr was trying to promote, or if some overzealous IMDB poster just got it wrong, but it could not be more incorrect.