Harry Potter Movie Poster
When Satan and Alciel first come to Earth and are leaving the police station they come across a number of movie posters in a back alley, one of which is a reference to Harry Potter.
Around 10 minutes into the first episode of The Devil Is A Part-Timer, we see Satan and Alciel, both freshly escaped from the police station, wondering the streets pondering the absence of magic on Earth and wondering how they’ll return home to Ente-Isla.
As the pair walk down an alley they pass in front of a movie theater and on the billboard above the theater we’re shown a closeup of 3 movie posters; one of them being for “Holy Potter: Blood of a Sorcerer and a Dragon”.
This poster is, as you guessed it, a reference towards the Harry Potter movie series with the title making a number of references towards the Harry Potter movies such as, “The Sorcerer’s Stone (1st book title, changed to Philosopher’s Stone for the movie)”, “The Half-Blood Prince” and “The Deathly Hallows Pt. 2 (the Gringotts dragon)”.