It's numbers time!   When Juliet punched in the code to activate the monster fence, the code utilized part of LOST's mystical number sequence:  4, 16, and 23.  You can see 16 and 23 here, I wasn't able to get a grab of her punching in 4.   Since she lifted the panel immediately after entering 23, we know for sure there was no 4, 8, 15, 16, 23, 42 sequence, which would have been amazing.