This episode and the following episode were responsible for the delay of the initial airing of the show because of the COVID-19 pandemic. The episodes had not been filmed by the time the show was supposed to go on air. Also note how the time has advanced to the summer of 1951 from December 1950, with green leaves on the trees.
Strychnine poisoning, while often portrayed in literature and film because of its dramatic and painful symptoms, is actually a poor choice. Its taste is extremely bitter and can be tasted by humans down to a dilute solution of 1:130,000. Still, isolated cases of murder by strychnine poisoning have been documented, as in the case of serial killer Thomas Neill Cream.