Did the windows on zeppelins open or not?

In this one, Liv's dad/Ian's Uncle Joe returns for a good ol' fashioned discussion about The Hindenburg disaster. Who would've guessed that the inside of a zeppelin is comparable to a cruise ship? By the end of the episode, you'll be familiar with a "flying moor" and how the Nazi regime affected SpongeBob.

Also, Liv hates noisy aircrafts. Joe isn't a fan of actress Ally Sheedy. Ian learns where Lactaid is made.