The commentary is a Brainfuck program which outputs: Closure is so cute.
Not sure if that should be the "translated" commentary or just a note.
After outputting the message, the program also makes a point of setting its first memory location to 42 and the rest to 0 and moving its data pointer back to the first cell, just for fun. (I suppose you could say it "returns 42" in a sense.)
Its internal logic uses 6 bytes of memory in total.