Not that I'm for screen shot, I imagine they wrote a quick script that went through a list of links to the comment and produced the screenshot (which also resized the height of the window to fit the full comment).

The script probably utilized an integration with a screen capture library. I'd imagine someone can write a script to parse html and dig out the comment, but the screen capture script was probably faster to write.

A slower method would be to copy and paste the text by hand...