Continuity mistake: In the episode "Team Diffy," Lloyd tells Andy that he noticed Andy had The Time Flyer 3000. But when Keely, Phil, and Andy are outside talking about if Phil would do Andy's prank, Andy says he is going to fire up The Time Flyer 2000, which is not the same one Lloyd noticed.
Continuity mistake: In the pilot episode, Keely is just becoming friends with Pim because she needs tutoring in algebra. In one of the final scenes, Pim comes up to Phil during lunch and says their dad called, so it's time for them to go home. When you first see Pim her necklace is undone, then when they are getting up to leave Pim's necklace is clasped.
Plot hole: In the episode "Where's the Wizard?", when Pim gets the Wizard from Lil' Danny, she holds it in her hand. When Lil' Danny steals it, he takes it out of Pim's backpack, meaning it must be Pim's Wizard. But when Phil points it out, she says it's hers. This could be a character mistake, but if it was Phil's Wizard, they would not be able to track the one Hackett had, because inputting the signal of Phil's Wizard would do nothing.