The intro to David Bowie's song "Let's Dance" plays at the beginning of the fight song on the record player. David Bowie is also the voice of Maltazard in the English version of the film.
The sacred sword that no one (not even Princess Selenia) can pull out of the stone (she implies that only the chosen one can pull it out) but Arthur is able to pull out easily is an homage to King Arthur and the legend of the Sword in the Stone. King Arthur (who the main character of this movie shares a name with) becomes king when he is able to pull a sword from the stone it was stuck in when no one else could.
The house is specified in the movie as located in Conneticut USA, is actually a real house somewhere in the British Isles (England) because the electricity power points are United Kingdom 240 volt earthed type with switches, visible on the wall just to the right of the piano when Arthur blows out the candles on his birthday cake and visible on the wall to the left of the broken door on the floor in Granny's bedroom.
While driving in the tunnel Arthur says he hopes that there are no speed cameras down there, but speed cameras weren't introduced until at least the late 1960s.