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.
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'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 Josie turns the doorknob, the doorknob turns to the right but Josie's hand is turning to the left.
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.
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.