Embarrassing First Name: Dr Bambi Berenbaum the entomologist. Mulder, or should we say Fox, even allows first name basis. Scully is amused.
Genius Cripple: Doctor Ivanov. He's on the wheelchair and he uses a computer voice synthesizer to speak.
Geeky Turn-On: After Scully talks at length about the likelihood of intelligent alien life evolving, and the implications this may hold for Darwinian theory, Mulder jokingly asks her what she's wearing. (See also Nerds Are Sexy below.)
I Need a Freaking Drink: Mulder and Dr Ivanov drink scotch after Dr Ivanov was shown the alien robot cockroach. Dr Ivanov particularly looks like he really needs it.
Jump Scare: If you're watching this episode for the first time, nothing is going to prepare for when that cockroach shows up on your screen. And just for kicks, we're not going to tell you when that happens. Trust us, it's beyond your comprehension...
Mundanger: Zig-zagged. The X-Files usually created scary atmosphere by something paranormal and straight use of Mundanger would suggest troubles caused by something ordinary, for example creepy cockroaches. There really is a mass hysteria created by cockroach infestation which is Primal Fear in itself. Also, there are several deaths. However, at least one of the cockroaches was made of metal and its technology was way too advanced to come from our planet. Some of the cockroaches really are robotic aliens. However, it's unclear if there are actually more of these. The others may very well be just the common kind. In addition, it turns out that the cockroaches - either alien robotic ones or common earth ones - were not the direct cause of the deaths that appeared in the episode.
Nerds Are Sexy: Scully on the budding romance of the doctors: "Smart is sexy."