Little Ricky had two goldfish (Mildred and Charles) in the episode "Lucy Wants to Move to the Country." In this episode, however, when Fred goes to the kitchen, he says "Hello, Moby." We see only one fish. What happened to the other fish?
Fred mentions that the Ricardo's rent for their apartment is only $125 a month. Today you can't rent an apartment in any part of NYC for less than $1000 a month!
Flub: When the Ricardos' and Mertzes' are moved in together temporarily, the phone rings and Fred hands it to Ricky without answering it first, but the phone and the apartment belongs to Fred, so he should of answered it first.
There are many references to the fact that Lucy and Ricky are leaving there apartment after 15 years, but they had only lived in that apartment for 4 years. They switched apartments after Little Ricky was born.
This is the last episode that takes place in the Ricardos' apartment.