Godzilla series reference in the anime In the RPG dream there are two tiny twin Mutsumis who sing to call out a giant Tama in the same way the twins who sing to call Mothra from the Godzilla and its spinoff films.
They will either sing alternating lines, or one will predominate while the other performs a counterpoint to the first's melodic line, sometimes in a format similar to traditional call-and-response.
Call Back: Several If Sam is drawing dead in a showdown, he'll sometimes sing the funeral march identical to the one The Heavy sang when he was eliminated from play in the first game.