The remastered version of this episode premiered in syndication the weekend of 13 January 2007. New shots of Scalos from space, as well as an enhanced matte painting of the surface were inserted into the episode, alongside more realistic phaser effects. This was the first remastered episode from third season to air and thus featured a "new" opening titles sequence.
Walter Koenig did not film any new footage for this. Chekov appears briefly in the opening scenes but it's stock footage from earlier productions. He takes no part in the plot.
This contains the second time in The Original Series where Kirk is seen in what can be presumed to be a post-coital situation. He is seen zipping up his boots while sitting on the edge of his bed, with Deela standing nearby arranging her hair.
The hyper-accelerated movement plot was also used in The Night of the Burning Diamond (1966), produced by Gene L. Coon/Lee Cronin.
Written by Lee Cronin, the pseudonym of Gene L. Coon. The pseudonym was used because he had left Paramount and was under contract with Universal, so he was not supposed to be working for Paramount as well.