Yeah i thought that.. but they said it's like a sieve, so I can understand a small degree of air.. but not enough to cause a gale
... and what about rain? The holes clearly cannot be big enough to allow it to rain properly. That was shown in an early episode where outside they're spraying it with a hose and the kid presses his hand against the wall from the inside (where they're not getting wet) and his hand comes away slightly damp). No way, that kind of hole placement would allow proper rainfall.