Question: What is that castle seen in the beginning? It can't be the beast's castle before it's cursed, because it has stained glass decorations of the night the prince became a beast. It can't be the castle during or after the curse, because it looks nothing like it.
Answer: The whole story is supposed to have already happened when we are seeing it, hence the "Once upon a time" intro, so these stained glass windows might be telling the prince's story. The ending, in fact, has a stained glass window of Belle and the Prince living happily ever after.
Question: If the beast was a young boy when he was turned into a beast, why is it the portrait of him he tears up looks like he does at the end of the film?
Answer: Additionally, it sometimes happened that artist made noble rulers look adult even while still young. So it could've been a historical borrowing to foreshadow his later appearance.
Answer: I think the prince was 11 when he was cursed.
Answer: He must have been in his teens at least, his portrait that he shreds was not of a 11 year old.
Answer: He is 11. 21 by first love '10 years we've been rusting'. (Be Our Guest). So, he was 11 due to the flower above to lose all petals.
Question: Gaston sings that he ate eggs to help him get large. Why didn't he say meat? Was he vegetarian? Was Disney deliberately supporting vegetarianism/respecting vegetarians? Are there any historical circumstances that I'm not aware of? Or am I just overanalyzing this matter?
Answer: Eggs are full of protein. Eating a lot of eggs is an excellent way to bulk up and build muscle mass.
Eggs are not good for you if you eat too many of them.
To quote Stephen Fry: "Well of course too much is bad for you, that's what "too much" means. If you had too much water it would be bad for you, wouldn't it? "Too much" precisely means that quantity which is excessive, that's what it means. Could you ever say "too much water is good for you"? I mean if it's too much it's too much. Too much of anything is too much. Obviously." That aside, while it used to be believed that the cholesterol content of eggs was a health risk, more recent studies have shown that dietary cholesterol doesn't affect blood cholesterol levels for most people. As such there's no real maximum limit on egg consumption beyond the aforementioned "too much of anything is too much".
I don't think Gaston cares much about his cholesterol.
They didn't even know the word.
Answer: While I was waiting for this question to be accepted, I found the answer to one of my questions myself. Gaston is indeed not vegetarian, considering he mentions his hunting trophies during the aforementioned song and earlier in the movie, he tells Belle to imagine him roasting his kill on the fire place.
Answer: It is the beast's castle before the curse. The stained glass windows were added as foreshadowing.
Phixius ★