Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

In Stranger Things 2, they say the portal takes a lot of energy to close, and that only El has the power to close it. But in the first season, portals to the Upside-Down crop up all over the place- in the Byers' home, in the tree in the woods, and by the swimming pool. What's the difference between the Hawkins' lab portal and the other ones?
Why is the portal so hard to close in Stranger Things 2, when the monster opened many in the first season?

In Game of Thrones S08E06 we see Jon visit Tyrion    after he had been arrested for treason.   It seems the guards do allow him into the room as Jon hands his sword over to them.   Knowing Tyrion, it's not far-fetched that he'd try to talk Jon into things. Hence my question, did Queen Daenerys allow the visit?
Did the queen allow Jon to visit Tyrion?

I couldn't help but notice in some of the score for Dunkirk (2017) that it sounded very familiar. Specifically the song "Variation 15" sounds like the classical piece "Nimrod" by Edward Elgar.  What is the significance Hans Zimmer is trying to convey by alluding so heavily to Nimrod?  Variation 15    Nimrod

What is the significance of Nimrod to Dunkirk's original score?