Vala mentions watching re-runs of The X-Files (1993). It was with this episode that Stargate SG-1 (1997) matched "The X-Files" as the longest running North American science fiction series at that time.
"Memento mori" is a Latin phrase that translates to "remember [that] you will die". It was a common practice among medieval Christians to meditate and reflect on one's mortality in order to instill the belief that life on Earth is supposed to be a stepping stone to something larger, that all Earthly goods were just vain, temporary possessions that would be lost upon death; and that they were to devote their study and attention to the immorality of the soul and the afterlife. The phrase is also used in art to describe artistic and symbolic reminders of human mortality.
Vala mentions watching reruns of The X-Files (1993) to Sal. One of the guest stars, Brendan Beiser, was a recurring character on X-Files, playing Agent Pendrell, who had a major crush on Agent Scully. X-Files also had its own episode called Memento Mori (1997).
Fun Fact: The name of the dinner that Vala is working in is Sol's. Sol is the name of our sun.