When Jake first starts writing his story using a pen and paper in Onaya's room, the ink on the first page is black, and when he starts on the second page, the ink is blue.
When Jake and Onaya first meet, she invites him to her quarters later, which he agrees to and does. However, she then leaves Jake without ever telling him where her quarters are on the station.
The first time Jeyal meets Odo, he pronounces Lwaxana's name as "Laxwana".