First appearance of Torres's engineering jacket, which Roxann Dawson needed to hide her real-life pregnancy.
Chakotay visualizes the moon in its pre-colonized state. In Star Trek: First Contact (1996), Commander Riker stated that the moon appears quite different in the 24th century than in the 21st century.
When the show starts and Lieutenant Paris is piloting the shuttle he's talking with Chakotay about his status. However when Lieutenant Commander Tuvok arrived on the bridge Lieutenant Paris was there on the bridge. This should indicate to the viewers that they're dreaming and not experiencing real events.
Everyone brought to sickbay is covered with a blanket. Usually, patients are left uncovered.
This takes place in 2374.