Bernstein's remote control door bell ringer invention could never possibly work, unless he was able to install some kind of receiver inside every single doorbell on the planet.
Irene calls and lists a number of neighbors whose doorbell rang with no one there. One of the names was Weidermeyer. Mrs. Weidermeyer had been a friend of Edith's who moved away a few years earlier; in fact, Irene is living in her house..
Mr. Bernstein asks Archie how he celebrates Brotherhood Week, and Archie replies that he doesn't, as he's an only child. In another show, he has a younger brother, who is seen at least once (Archie's answer may have been due to him having pretty much "dis-owned" his brother Fred).