Nancy Kovack and Frank Wilcox will appear in the same roles in If They Never Met (1968), the next episode of the series.
The shows episodes were filmed in a different order than the actual airing sequence. This episode was filmed on July 10, 1967, 20 days after the following episode which was filmed on June 20, 1967. Both were only aired in the beginning of 1968.
Larry Tate tells Darrin that he, Darrin is irascible. Later both Darrin and Samantha admit that neither of them know what the word irascible means. Irascible: Having or showing a tendency to be easily angered.
The title refers to the expression "snake in the grass."