Inverted: Alice enters a huge gateway and ends up in a tiny privy.
It seems to be bigger on the inside at first, but it is later shown that it was all a trick of the light.
Alice is showed opening the door to the portaloo and in the next scene she is inside a large hall. It turns out the hall is not actually inside the portaloo.
The trick of the light was that the portaloo is actually a lot smaller.
Alice is showed opening the door to the portaloo and in the next scene she is inside a large hall. It turns out the hall is not actually inside the portaloo. It's in a phone booth.
Parodied: Alice steps into the portaloo and ends up in a huge golden mansion. She heads off to look for the toilets.
Zig Zagged: The portaloo is actually a huge building deliberately made to look smaller, but the inside is still abnormally huge, but occasionally its interior takes the size and shape of a portaloo anyway, except that when you leave the exit turns out to be a large gateway that fades back to portaloo shape when you blink again.
Averted: Alice opens the door to the portaloo and steps into a portaloo.
Enforced: The editor REALLY has a thing for bigger-on-the-inside spacecraft and wanted to slip in a reference to one.
Lampshaded: Alice comments "Why are these places always bigger than they look?"
Invoked: The owner of the portaloo deliberately makes the interior bigger than normal in order to have room for his concert hall.
Exploited: Alice uses the portaloo to hide because the portaloo is the last place they'd look in.
Defied: Alice refuses to enter the portaloo, "I'll walk in there and it'll be the size of a planet and I'll gasp in astonishment and question my own sanity. I'm not going."
Discussed: "This isn't a sci-fi film! In the REAL world portaloos are small, cramped and uncomfortable!"
Conversed: "Quick! Head for the portaloo! If we're lucky it'll lead to a huge mansion we can hide in!"