In the opening Captain Sheridan is shown practicing baseball inside the central core, which is rotating. While the ball would travel in a straight line, it would appear to curve down and to one side to an observer standing inside the core Due Coriolis effect.
In the final scene during the camera pan of Babylon 5, you can briefly see the star field background inside the docking bay port.
Missing Foley: When Lando initially sets out the pair of gold goblets, they "clink" on the table like glass, but when Jaddo refills them, they "clatter" evidencing they are plastic. Later, when both Lando and Jaddo set their goblets down off screen, they "clink" again.