Although he often sang on the series, notably his signature "Speedy Delivery to you"; David Newell admitted that, he felt, he could never properly sing or carry a tune.
A lot of people have asked me how they can get a trolley like mine to play with. And I usually say, "Why don't you just make one?"
In the 1979-1981 episodes when Mr. Rogers takes off his sweater and closes the closet door, he'd often close it too fast so it came open a ways, but then the closet door begins to close on its own, as if someone were behind the door pulling it closed.
The week of episode #1476, aired in 1981, was the only week of programs during the modern era (1979-2001) not to feature the theme title ("Divorce", in this case) following the show's main title in the opening credits.
Various theme-week episodes were released to video in the late-1980s in a special format. For instance, the week of "Day Care and Night Care" (#1516-1520) was released to video under the title "When Parents Are Away", and featured the Neighborhood of Make-Believe segments, edited into new segments featuring Mr. Rogers, as well as old segments like him visiting the day care home. In the old version, Fred meets Mr. McFeely at Brockett's bakery and they go to the day care home together. But in the video version, Mr. McFeely visits Mr. Rogers from Brockett's bakery and they leave from the house.