The rotary phone in Harry and Monica's apartment is identical to the toy phone in the original Twilight Zone episode Long Distance Call (1961).
The two teenage girls that Luntz/Harry walks past are wearing St Mary's school jackets. St. Mary's is the girl's boarding school in Among the Untrodden (2020).
When Luntz/Harry walks past two teenage girls, there is a cardboard sign nearby saying "Time Enough at Last" and a drawing of a clock. This refers to Time Enough at Last (1959), Burgess Meredith episode where he had all the time to read his books, if it were not for his broken glasses, an episode of the original 'Twilight Zone' series.
This episode is a reimagining of "The Self-Improvement of Salvadore Ross (1964) (1/17/1964)" from the original Twilight Zone.