Observations in TNG: "Déjà Q"

The white "X" at the left side of the screen and the two green "Xs" behind the glass consoles are design elements that often show up in Klingon buildings in later episodes, like "Sins of the Father", "The Mind's Eye", "Redemption I+II" and "Birthright I+II".

Another very fuzzy shot owing to the FX inserted into this shot in post production.

The lunar craters visible on the viewscreen are similar to craters seen on Vandor IV in "We'll Always Have Paris" and the moon of Bringloid V in "Up the Long Ladder".

Q and Worf use a turbolift to get from the bridge to a corridor leading to the brig. The door they are seen leaving the turbolift through, though, normally is the door to the junior officers' quarters. When they enter the brig, the wrong doors are used again. They are seen standing in front of the shuttlebay/cargo bay/holodeck door but the shot from the inside the brig shows a different corridor behind them. Like in its first appearance, in "The Hunted", the brig wasn't directly attached to the newly extended major corridor set. It was instead accessed from a short fake corridor leading nowhere else.

Clever editing was used to create the illusion that Worf and Q were entering the brig from the large corridor set. The give-away, however, is the wall behind the brig door. The regular corridor walls consist of 3 1/2 panels and are not lit at the bottom. The fake corridor wall seen here features a light at the bottom and 4 panels. The door opposite the brig door also is not present in the large corridor set.

The comparison shot from "The Hunted" reveals that the brig set has not changed much since it was last seen in that episode, only some of the consoles in the background were changed.

The consoles previously appeared in Dr. Paul Stubbs's quarters in "Evolution" and drawing room 5 in "Booby Trap". The whole set, consisting of parts of the original battle bridge, was earlier seen as drawing room 5, in fact. It also appeared as the outpost in "The Vengeance Factor".

A graphic of Bre'el IV and its moon displayed on the slanted "pool table" monitor.

This is the right monitor when facing the warp core. Only the monitor on the opposite side was supplemented with blue LCARS buttons for "The Defector".

The cutlery seen here was also seen in earlier TNG episodes, such as "Manhunt" and "The Price".

It appears that Geordi's uniform has been washed quite often by now, as the structure of the fabric reveals.

The costumes worn by the Bre'el IV scientists in this episode were originally created for the Promellians, seen in "Booby Trap". They are later worn by members of Pardshay's species in several DS9 episodes.
Re-Used Make-ups

The PADD-like device held by the scientist in the background originally was the identity scanner used during Data's trial in "The Measure of a Man". It is also held by a background Romulan on Romulus in "Unification I".

The shot of the Calamarain enveloping Q was shot anamorphically to allow camera movement during an FX shot. By using the method of "pan and scan" the camera movement was achieved. This explains why the shot shows a lot of grain.
Pan & Scan Effects in TNG

Note the cables that are visible on the floor behind the seat of the chair.

The scanner Geordi uses to scan on Data switches between shots. At first, the scanner is rather large. When the shot switches, he suddenly holds an oscillation overthruster from the film "The Adventures of Buckaroo Banzai Across the 8th Dimension" in his hands. The prop previously appeared as a geological tool in "Pen Pals".
Re-Used Props - Engineering Tools

Q2's head briefly pops through the cockpit wall as Q looks at the now powerless Calamarain.

This part of the shuttle set also has not changed a lot since season 2. Notice how just a little tape and LCARS sticker magic makes the small set look much more impressive!