The planet Weytan was an inspired wordplay from the Star Trek: Deep Space Nine (1993) characters Weyoun and Keevan, members of the Vorta species. They were played by Jeffrey Combs and Christopher Shea who play Andorians here.
Suzie Plakson, who appears as the Andorian Tarah, also played a Q in The Q and the Grey (1996), the Vulcan Lt. Doctor Selar in The Schizoid Man (1989) and the human-Klingon hybrid K'Ehleyr in The Emissary (1989) and Reunion (1990).
This episode continues the Andorians-versus-Vulcans arc that started in The Andorian Incident (2001) and was followed up in Shadows of P'Jem (2002).
This is the first episode of Enterprise to have all the monitors on the bridge changed to display alert status during tactical alert.
First mention of Archer's fondness for Andorian ale, which is also mentioned in Proving Ground (2004) and Babel One (2005).