Questions you didn't know anybody wanted the answer to

https://www.youtube.com/watch?v=tfdRtf9GYwk

pgs 63-66: In which Gogo and Didi, bored as ever, pretend to be Pozzo and Lucky; and when that doesn't work and Gogo tries running away, try hiding; and when that doesn't work, try shouting insults at each other until they decide to make up to each other.

Questions:
Why, when Didi was pretending to be Lucky and Gogo, Pozzo, was Didi unable to think unlike Lucky in act I?
Why did Estragon say he's cursed/in hell when attempting to leave the stage? Why exactly can't he leave the stage at all?
Who's "they're" in "They're coming!" that's supposedly after Gogo and Didi when the two don't know who "they" are?
What was auditorium supposed to represent when the two point at that direction and conclude that there's "not a soul in sight"?
What's the meaning behind the very narrow tree that doesn't allow Gogo to be completely hidden from whatever's supposedly surrounding him and Didi?
Why does Estragon suggest to Didi that they go "back to back like in the good old days"? And what does he mean by that term?
Besides Godot, what could the two possibly be looking out for during their watch?
What's the meaning behind the impromptu insult-shouting match at each other? And why does Gogo say "that's the idea"?
Why does Didi seem to take the most offense at the word "critic"? Could it possibly be some sort of "take that" to critics of Samuel Beckett's other plays?
Why do the two make up after shouting insults at each other?
Notice how in some stage productions, the two dance when they make up, when the script simply says that "they embrace", then "they separate. Silence." Why add the dance? What does it represent?
Last but not least, were the two subjecting themselves to such tomfoolery as described in this scene just because they were extremely bored and have nothing better to do? How else would this tomfoolery be interpreted?