The family car has a different color, size, and shape in this episode that in other episodes.
Jenna's father in seen in "Jenna's Bedtime Blues." Her mother was shown in "Muffy's New Best Friend."
In "The Boy With His Head In The Clouds," George mentions that he got Wally back from DW when he takes the puppet out of a box.
In "Is There a Doctor In the House?" when D.W. initially enters Arthur's room at night during the storm, Mary Moo Cow is drawn with larger, longer horns than usual. But in the next shot showing the Mary doll, her horns are back to normal.
When we flash back to Binky with Mr. Ratburn's previous third-grade class, Prunella is not with them. Prunella had said that she was in Mr. Ratburn's class the previous year, so she should have been classmates with Binky!
In "The World of Tomorrow," while at the museum, Sue Ellen and George do the same thing that their look alikes did last year. Sue Ellen (and her look alike) rubs their feet on the carpet and shock Binky, at the static electricity exhibit. George (and his look alike) set off an alarm by sneaking and stealing a model car from an exhibit.
Viewers learn in "The World of Tomorrow" that Binky was in Mr. Ratburn's class the year before. Previously, it had only been stated that he was made to repeat third grade.
In Mr. Ratburn's other third grade class, the one Binky was in, there are kids that look, wear colors, and have characteristics just like Francine, Sue Ellen, Fern, Jenna, Arthur, Buster, George, and the Brain. The same thing applies to the students in Mr. Price-Jones' class.
In this episode, Binky hates mac'n'cheese, but in "Francine Redecorates" he says he loves mac'n'cheese!
The aliens in "Return of the Snowball" have a different appearance from when they were seen first taking the snowball in "D.W.'s Snow Mystery."
The final song in the show refers to past events of the series: the "very mean crossing guard" from "Arthur vs. the Very Mean Crossing Guard," the comet that Buster discovered in "The Boy Who Cried Comet," and the blizzard that hit Elwood City in "The Blizzard." Although Buster says that he has a comet named after him, the comet was given a name in "The Boy Who Cried Comet."
Art Garfunkel makes another appearance in this episode. His last appearance, in which he was known as "the singing moose," was in "The Ballad of Buster Baxter."
Binky splits his pants again in this episode. The first time was in "Arthur's Underwear."
In this episode, we learn that Elwood City was founded by Jacob Katzenellenbogan.
As the musical begins, Prunella is shown handling the spotlights. She is a fourth-grader and shouldn't be involved with a third-grade musical.
During "Waiting to Go," after Binky spells a word out of pebbles, it clearly reads "help." When Buster arrives to the sign, the H turns into a K, spelling kelp --- a gag referring back to a previous story. Also, the amount of pebbles in the letters change.
In "Don't Ask Muffy," during the Hoprah fantasy scene, there are two scenes with the same audience. The first scene was after the lady admitted that she wanted to redecorate her room. In the second scene, after Muffy says "Like the power of redecorating," most of the audience changes colors. For example, the old rabbit's sweater turns green and people's skin get lighter.
In the story "Arthur Loses His Marbles," while Muffy is videotaping the marbles tournament, the date on her camera says May 25, but in "Muffy Goes Metropolitan," the date is May 25.
When Kate is negotiating with Mr. Toad, she asks him if he wants Arthur's Woogle, to which he responds "that fad went out with the '90s." Woogles first appeared in the story Arthur Rides the Bandwagon," in which Woogles becomes the latest fad, but then died out. That episode aired in 1998.
Toady, first seen in the first season story "So Long, Spanky" makes a return appearance in "The Great Sock Mystery." Viewers learn in this episode that though D.W. adopted Toady following the death of her parrot, he is now living free again.