/10 with 3 votes
When Porco goes and checks out the new engine it has the word Ghibli on it, that is the company that did the film.
Studio Ghibli Banner
/10 with 2 votes
When Porco drives the truck with Fio and takes a sharp turn at the street crossing there is a Studio Ghibli banner at the house corner.
P.S. be quick it is only visible for 2 frames.