First appearance of a Jefferies Tube on this series.
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 for 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.