Observations in TNG: "The Wounded"

The underside of the Galor-class ship and the way the Enterprise-D's phaser beam reflects from its shield bubble can be seen in these screenshots.

The familiar colorful Cardassian emblem wouldn't appear until "Chain of Command II". Right now, we can just see the simple dark red emblem on the hull of the Galor class.
The Evolution of the Cardassian Emblem

The dimly lit bridge of a Galor-class starship can be seen in these two shots. The next few times the bridge of such a ship is seen, it is somewhat brighter.
Variations and Redresses of the Galor Class Bridge

The captain's chair previously appeared on the Klingon Bird-of-Prey in "Star Trek V: The Final Frontier" and also as the chair in which K'mpec died in "Reunion". The captain is the only one on the Cardassian bridge who has the luxury of a seat.

The interestingly shaped Cardassian helmets only appear in this episode, while the brown Cardassian uniforms are also seen in "Ensign Ro", before they are replaced by the much more familiar uniforms seen on DS9.

A nice shot of the USS Enterprise-D facing the Galor-class ship. The footage was reused three times, in "Chain of Command I+II" and "Preemptive Strike". It is interesting to see how the shot changes slightly in each appearance. In "The Wounded", both the deflector and the other lights on the Cardassian ship are still yellow. In "Chain of Command I", and already in the SD episode, the whole shot looks much more red, including the deflector and all other lights, maybe to adapt the original shot to the new color of the deflector established in "Emissary". In "Chain of Command II", the shot appears a little less red. In "Preemptive Strike", the deflector is fully red, finally, and the other large lights are yellow. Additional hull lights were also added for this shot of the ship.

The shot of the USS Enterprise-D was newly created for this episode, using the 4-foot model. A screenshot from the same episode shows what the 6-foot model looks like from a nearly identical angle.

The pixelated original graphics were replaced with HD animations.

The original string of numbers when the weapon impact is being displayed was replaced with a new display, starting with "Sustained direct weapons hit..." and showing useful data.

The painting of the USS Enterprise-D in Picard's ready room can be nicely seen in these shots. The painting was reframed after the Enterprise-D crashed in "Generations" and is still is covered in soot in some areas in PIC: "The Next Generation".

One other constant feature of the ready room appears for the first time in this episode, a glass model of a sailing ship. The model replaces a transparent globe seen in the same spot in several earlier episodes.

The dedication plaque of the USS Phoenix can be seen behind Captain Maxwell in this shot.

The wall panels of the ready room appear in several other episodes and movies, such as "Unnatural Selection", "A Matter of Perspective", "Sarek" and "Star Trek V: The Final Frontier".