Wolfe advises the the client, Lucy Valdon, enter the brownstone by the back way, as Wolfe's house is under surveillance. Upon leaving, Archie shows her out by the front door.
The title sequence features a rolling baby carriage the small wheel(s) are rotating at the same rate as the large one(s). The smaller ones would rotate faster than the larger ones.
Wolfe's men set up their baby sting operation in what is supposed to be Washington Square Park. There is no lake in the landmark Greenwich Village park.