T'Pol finally reveals her age to Trip (66-years-old on her next birthday) - something Trip has been trying to learn since they left Spacedock.
It is revealed in this episode that the founding members of the United Federation of Planets are Humans, Vulcans, Andorians and Tellarites.
This episode received an Emmy Award nomination for Michael Westmore's Outstanding Prosthetic Makeup For A Series, Miniseries, Movie Or A Special.
The window behind Daniels and Jonathan Archer in the signing ceremony scene is a reuse of the port used on the USS Enterprise-J in Azati Prime (2004), which was also a scene where Daniels brought Archer into the future.
The scene of Xindi-Reptilians eating live rodents is reminiscent (or a direct homage) to the alien visitors doing the same in the classic miniseries V (1983).