Other mistake: Harriet phones a plasterer to repair a wall in the boys' bedroom. He says he will be there the next day. Ozzie phones Mr. Baxter and asks him to replace a broken rain gutter. Baxter comes to the house and tells Ozzie he has two big jobs to finish and "it will be about a week" - but he shows up the next day, same as the plasterer.
The Adventures of Ozzie & Harriet (1952)
1 other mistake in The Bird's Nest - chronological order
Starring: Harriet Hilliard, Ricky Nelson, David Nelson, Ozzie Nelson
Ozzie and the Bridge Group - S6-E34
Continuity mistake: Ozzie goes to a boxing match. Stock footage shows two boxers fighting in a ring surrounded on all sides by ten rows of seats. Almost every seat is occupied. The close-ups show Ozzie sitting in the front row and there are only three rows of seats behind him.
Trivia: In the later seasons, almost every scene taking place at the Dobson and Kelly law office or in the Emporium or other local business is preceded by the same clip of a downtown street showing "First Bank" and a passing bus.