So, the last few episodes in the winter of season two were carried forward by Emma and Co. needing to know about and get the squid-ink from Rump's jail cell to destroy Cora. However, they ended up merely using the squid-ink to escape from said jail cell, which they wouldn't have needed to do if they hadn't gone to the cell in the first place. Hence, a plot loophole.
Any thoughts? Any other places where this has happened in the series?