For some reason, Mister Rogers is famous for saying, "Can you say ____?" The line appears in several parodies but aside from asking his viewers to say "pentagon" in an early episode, he literally never said it on the show, and in fact thought the phrase would be an insult to the intelligence of even his very young audience. He did ask his viewers "Can you _____ now?" at least once, though.
This trope also applies to the opening theme song. Many people thing the lyrics are "It's a beautiful day in the neighborhood" when it's actually "It's a beautiful day in this neighborhood".
Common Knowledge: Despite rumors, he was never a sniper, nor was he ever in the military, nor did he wear the sweaters to cover up his tattoos. Nobody is quite sure just where the rumors started.
The Danza: Quite a few. Bob Trow as Robert Troll and Bob Dog, Joe Negri as Handyman Negri, Don Brockett as Chef Brockett, Audrey Roth as Audrey Paulifficate, Maggie Stewart as Mayor Maggie....
Nice Character, Mean Actor: Completely and utterly averted. Despite whatever fake stories flitter around the internet and other presenters of children's shows, Mr. Rogers took pride in being every bit as warm and friendly in real life as he was on television.
No Export for You: Oddly enough, despite being wildly popular in his native U.S., the show was never broadcast outside of America.
One of Us: Fred said that each of the characters in the neighborhood of make believe had a little aspect of his own personality. We all know if he had Lady Elaine Fairchild in him, he was truly a normal human like the rest of us.
When he mentioned that one of the few TV shows he enjoyed watching was Dr. Quinn, Medicine Woman, the producers arranged for him to be a Guest Star. He played the role of "Reverend Thomas" in his only TV appearance as a fictional human character.
John Boswell, creator of Symphony Of Science, is a huge fan of Mr. Rogers, something PBS undoubtedly took into consideration when they commissioned him to compose "Garden Of Your Mind."
The Resolution Will Not Be Identified: The last episode was treated like any other, with the understanding that the show would live on in reruns. Mr. Rogers did show some pictures of his neighbors, and he shook hands with Mr. McFeely.
Talking to Himself: Fred Rogers voiced most of the Neighborhood of Make-Believe puppets, including King Friday XIII, Queen Sara Saturday, Cornflake S. Pecially, Henrietta Pussycat, X the Owl, Lady Elaine Fairchild, and Daniel Striped Tiger, many of whom had conversations with each other that involved Rogers supplying all of the relevant voices.
When Sesame Street's Big Bird appeared on the show, Rogers' original script called for his performer, Caroll Spinney, to remove his costume and discuss the inner-workings of the Big Bird puppet. Spinney objected, however, because he didn't believe in ruining the illusion of Big Bird for the children, having been advised not to by Jim Henson. Big Bird ended up appearing as himself in the Neighborhood of Make-Believe.
As a compromise, the same episode had Rogers donning a giraffe costume and telling the viewers, "When you see big make-believe creatures in parades or in plays or on television, you can know that the people inside are just pretending to be something else."