 Whilst filming the episode, Bakula described it as "potentially the best script we 've had and the best show to date". He found it hard to describe, saying it involved "time travel into the future, parasites in my hippocampus, and Xindi and subspace implosions". In order to represent the changes in time frames throughout the episodes, several of the cast were required to have their make-up adjusted between scenes. This included adding grey make-up to the dog actor who portrayed Archer's dog, Porthos, but the scene was cut from the final broadcast. Costume changes were made to represent promotions granted to the characters over the changes in time periods. These included Bakula who wore a wig during the later time periods shown in the episode. The wig he wore had originally been created for Gary Graham in his role as Ambassador Soval. The sets on the Enterprise were dressed to represent ongoing wear and tear.
