Both Zark and Illya says that "Chiroptera" is Latin for "bat." It's Greek, not Latin.
Zark says that bats navigate by radar. They navigate by sonar, since they have no ability to emit radio waves.
When Zark runs out of the lab at the end, it's clear that the "bats" that are supposedly flying around are just paper constructs that a stagehand dropped from the ceiling.
Although Waverly gives Warshowsky's first name as Armand in the opening teaser, the end credits say his name is "Boris."
In the opening sequence when the second gas bomb was thrown the red smoke actually started to emanate from a point a few feet away before the bomb itself started to produce its own smoke.