The only characters to appear in all three [Star Trek] series based in the 24th Century ([Star Trek: The Next Generation], [Star Trek: Deep Space Nine] and [Star Trek: Voyager]) are Quark, Q, Riker and Gul Evek.
The ceiling of the transporter chamber on the Enterprise D is in fact the floor of the transporter chamber from the Enterprise in the [original] series.
The original version of the Starfleet uniform was very uncomfortable for the actors, leading to a change of design from one-piece to a two-piece outfit in [Season Three]. Although the new uniforms were easier to wear, the jackets had a tendency to "ride up" when the actors were sitting down. Patrick StewartPatrick Stewart got into the habit of straightening his jacket with a sharp downward tug as he stood up, an action that became known among the cast and crew as "The Picard Maneuver" (from a tactical maneuver mentioned in the show).
Tim RussTim Russ was a candidate for the role of Geordi.
The Master Alarm sound was reused from the original [Star Trek] series.
The corridor, engineering, transporter room, and battle bridge sets were derived from sets originally built for the first fourStarTrekmovies. A majority of the sets also served as different locations on the Enterprise-A in the fifth and sixth [Star Trek] films.
Along with other humorous readouts, the table in Engineering has an item labeled "Infinte Improbability Generator" in a reference to the propulsion system aboard the Heart of Gold in Douglas AdamsDouglas Adams' Hitchhiker's Guide to the Galaxy.
Denise CrosbyDenise Crosby was originally cast as Troi, and Marina SirtisMarina Sirtis was originally cast as Yar. Prior to filming the two exchanged roles.