When Peter is talking to Nina, you can see a pin on her shirt. It looks like a Reef Knot (Square Knot)…
Nina's pin
I did a little research, but I couldn’t seem to find any correlation between the knot and science. Although it is considered very dangerous and untrustworthy. The story goes sailors used this knot on their bags for they did not trust landsman. If a thief closed the bag after his theft, he would close it with a reef-knot, which is detectable by the sailor. Maybe it is symbolic of Peter trusting Nina and making a deal with her, or maybe it’s just a brooch…but I will be watching for this symbol again in future episodes.
