A side effect of this reshoot is Anakin's lightsaber occasionally showing up in Palpatine's hands in this fight, which was how it played out the first time around.
(asked in the thread: what was the change?) Anakin was originally standing with Palpatine when the Jedi came to arrest the chancellor. Rather than have his own lightsaber, Palpatine called Anakin's from his belt into his hand, and killed the Jedi and fought Mace with it.
Among the reasons for the change is Anakin seeming too inert during all this. He was removed from Palpatine's office, and the scene where he tells Mace about Palpatine was added, as well as him being alone in the Council chamber thinkin of Padmé, to clarify his motivations.
These scenes were all photographed in August of 2004 at Shepperton Studios, about a year after principal photography had wrapped at Sydney.
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This is the "Rebel cannon sled", a piece of production design that attempted to maximize value by building it on a real vehicle. In this case, an AKTIV snow trac sled.
If there was any intentionality in the letters TK or FN, I don't know of it. In the case of FN, my recollection is his name Finn came long before the idea that Poe named him was developed. So "FN" was reverse-engineered from Finn. As for TK...
I am doubtful it was intended to mean anything specific, because the script had it as TX. It was changed to TK during production. Don't know why. But if you look at early sources, it was TK-421. The novelization ('76) even went so far as to use THX-1138 as the trooper number.
In the years since, in large part due to the work of the @501stLegion, the term "TK" has become a standardized way of discussing stormtrooper numbers. The Mandalorian, I think, was the first place to use "TK number" in dialog.