When Principal Durst goes to return Marshall's cell phone and finds both phones missing, when did she confiscate them? She gave Tyler's phone to Professor Z and Marshall kept his phone, then they reversed the encryption code on Marshall. The giving of both phones to Principal Durst was not seen and doesn't seem to fit correctly with timing. If it occurred when Marshall was telling Principal Durst the truth, Victor would have had no chance to take the phones.
Marshall shrugs when asked what site he got the computer code from but was able to correctly tell them the internet path later when they were in his room.
When the liquid is spilling from Prof. Z's cup, it's almost transparent implying that the liquid was coffee but when he's mopping it off the floor it's brown tea.
First appearance of Magnet 360.
In Chemistry when Marshall is Neon, there's a bit when he's sitting or standing right next to a window - you can very clearly see reflected in the glass a very normal, non red, non glowing Marshall.
Although the Helium atomic model seemingly picks up balls from the nearby box, nothing in the box moves, the balls appear to have materialized out of air.
The Chlorine atomic model has less than 17 electrons while the Sodium atomic model only has 9 atomic atoms, the correct number of electrons in Chlorine is 17 and the number in Sodium is 11.
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)
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.
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.
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.
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.