##Explanation:##
In Lua, --[[ means multiline comment, -- means one line comment, and [[ is multiline string.
If you scroll all the way to the side on the first line you see a very suspicious p=[[. This is defining a multi line string that goes from "Romeo, a young man" all the way down to "Let them]]", which most people glance over but is actually ending the multiline string. Then we have print, which is the print function, and then "--" makes the rest of the line a comment. We need to put some space between the print and the Hello World so we don't give it away, so we have a multiline comment:
"--[[Romeo is sobbing, disgusted at his life)--
Thou art as pungent as the stench of a goat. Speak thy mind!
[[Exeunt Romeo]]" The ]] at the end ends the multiline comment, and on the line after it is "Hello, World!" and then the rest of the line is commented out by a --.
Removing all the comments from that area it becomes:
Thou art as loving as the product of the bluest clearest sweetest sky
and the sum of a squirrel and a white horse. Thou art as beautiful as the difference between Juliet and thyself.
Speak thy mind! Let them]] print
"Hello, world!"