First appearance of a Jefferies Tube on this series.
Dr. Aspen/Angel makes the comment "Pok tar, pok tah", a variation on potato, po-tah-to, when talking to T'Pring. Pok tar is a type of Vulcan food, mentioned in Breaking the Ice (2001).
The energy beams used in an attempt to trap the Enterprise look very similar to those in The Tholian Web (1968).
The character of Ensign Shankar is a name reference to Naren Shankar, who was a story editor Star Trek: The Next Generation (1987) and wrote stories for TNG, Star Trek: Voyager (1995), Star Trek: Deep Space Nine (1993), and at least two computer games for the franchise.