The two gentlemen renters' names apparently refer to cocktails. Mr. Pimm is named after the Pimm "fruit cup" liqueurs, the most famous of which is Pimm's No. 1 used to make the famous British beverage the Pimm's cup. Mr. Collins is named after the Tom Collins, a cocktail made from gin, lemon juice, sugar, and carbonated water.
For some unknown reason this episode isn't on paramount streaming.
The only episode where none of the Midnight Society threw the powder onto the fire by hand after removing it from the pouch (Megan tossed it from a goblet).
One of eleven episodes where the Midnight Society didn't leave and douse the fire with the water-bucket (Megan was eating a sandwich at the table).