What were the two siblings referencing in episode 5 of No Game No Life? In episode 5 of No Game No Life, when the two siblings saw the home of the Flugle, they said something and their clothes changed.

I'm pretty sure it was a reference to something, but I can't figure it out.

What were the two siblings referencing?
Judging by how they said "Laputa is real" as soon as they see it, I googled 'Laputa', and it seems to refer to Laputa: Castle in the Sky, which is a Studio Ghibli film. The poster on the Wikipedia page has the main characters who seem to match the attire that Sora and Shiro change into.

As for the partly censored word they say later, when trying to figure out how to get up to Avant Heim, I am not sure if it is linked to the movie since I haven't seen it. However, considering they comment that "the servers here are better", it seemed like they were using an abusive/offensive word to see if something would glitch. MMORPG games usually kick out players who use such speech, and while I can't recall exactly which game / instance this might be referring to, I have heard similar references before.