At the second fire, the warehouse guard dials the phone before he picks the receiver up.
All the fires happen at midnight, but when the Black Beauty pulls up to the second warehouse, it seems to be the middle of the afternoon.
There is evidence that this episode may have not aired in order. In fact, a "title" search in the US Copyright search engine shows this episode being "published" in 1980, while all other episodes in this series being published in 1966 and 1967.
Some episode guides list this episode as the last in the series, placing the original telecast on 24 March 1967. "TV Guide" magazine shows "Seek, Stalk, and Destroy" scheduled for 30 December 1966.