In the scene where the away team is thrown backward, Marina Sirtis broke her coccyx (her tail bone). It was an injury that caused pain for more than a month and made sitting extremely painful. She was the only one in the group who actually performed the stunt herself. She later reflected that anyone could have done it really because her face was barely even visible in the finished shot. "It could have been Worf in Troi's costume and we wouldn't have known the difference."
Seatbelts make a rare appearance in this episode, inside the shuttlecraft.
Pattern enhancers make their first appearance in this episode.
It is mentioned that Starfleet retired the last Daedalus-class starship in 2196.
Miles O'Brien is possessed by an alien and torments his wife Keiko. This situation would be reversed in Star Trek Deep Space Nine "The Assignment" when Keiko is possessed by a Pah Wraith and forces Miles to do her bidding.