In the beginning of this episode, we see Lucas rushing to his old science professor to give him his science paper, right before he dissappeared. We find out more about this scene in the episode Tesseract.
In this episode we can see the character of Vaughn Pearson wearing a cast. This wasn't actually part of the story, but due to the actor's condition the producers decided to include it in the plot.
When Josie turns the doorknob, the doorknob turns to the right but Josie's hand is turning to the left.
Josie's dance changes with each repeat of the day.
The first day the principal drops yellow papers, yet Corrine only picks up some folders, another day the principal drops white papers and another day she drops folders, isnt she supposed to drop the same thing?
On the third day when Corrine and the rest of the science club are discussing gravity and time loops, you can see a student sitting in one of the desks behind Vaughn yet almost everybody mentions the black hole.
When the Science Club is going over what happened to them, Josie forgets about being magnitized and when they made the clone of Josie.
The story, teleplay, directed by, and executive producer are shown twice at the beginning of the episode.
Josie said it took her an hour and a half to get up the steps to Josie and Corrine's room. Yet the hallway in which Josie shrunk is on the same floor as their room. Why would Josie climb the steps?
Before Josie climbs up onto the desk in her and Corrine's room, Corrine's earphones wire is on Corrine's left. In the next scene, it switches to Corrine's right, and after that it switches back to her left. It does this about 4 or 5 times before finally remaining on the left side.
Josie is told she has to get back to the wormhole gate and return to her own time. This would actually create the anomaly she wants to avoid. The gate that opens up in Wormhole2, like the one at the end of Shrunk, should be the same path and, thus, lead to the past again, not back to the future. If she had just stayed put, the Josie from the Shrunk timeline would have gone into the past and left only one Josie in the current timeline.
On a related note, if having two of the same person in one universe would make it collapse on itself, then that should have happened right away.
Time travel consequences are emphasized more than the earlier time travel episodes.
When Vaughn is with Corrine and Professor Z in the science lab looking at the map he and Corrine made, you can see that Vaughn's wearing a short-sleeve uniform shirt. But when he's with Corrine, Professor Z, Josie, Lucas, and Marshall in Lucas and Marshall's room, Vaughn's wearing a long-sleeve uniform shirt. Also, when he, Corrine, and Professor Z are leaving to go to the basement, he's wearing a short-sleeve uniform shirt.
When everyone is in Lucas and Marshall's room, when Josie says the sneeze comes from the basement, the plug to the server is away from the desk the server is on, but in the scene where Josie unplugs it the plug and its outlet are under the table.
Josie says that there is a vortex in the basement. In all other episodes, the vortex is in Professor Z's office (when opened naturally, unlike in Wormhole²).
When everyone is in Lucas and Marshall's room, when Josie says the sneeze comes from the basement, when the sneeze shakes the school, none of the medicine viles on the wheeled cart shake.
When Durst gives "the lucster" detention she says it is for this afternoon, but then when Lucas was about to confront Victor and Josie pulls him aside she reminds him of being put in detention for that and he said that he has to be out of detention b/c of the fight at 3pm......so why didn't he go? Wouldn't he be in more trouble?
The way Professor Z holds Lucas's slide when showing it to Josie is incorrect. It is a rule to hold a microscope slide by it's rim or it's label, which a professor should know.
Vaughn has dislexia.
Before Lucas and Vaughn switch for the first time, the patch on Lucas' forehead has the wire on the side, but after they switch the wire is going straight down his face. (Contributor: karategrl)