Deliberate mistake: When the kids are about to jump start the trap Phoebe hides behind the school bus door. Half a second later, when the trap opens, she's nowhere to be seen, not even jumping or stepping inside the bus. Then half a second later she has managed to get inside, turn around and protect her head while the bus windows burst. It all happens in real time for their hairs are still fluttering. It sure paces up the scene, but it's really awkward.
Deliberate mistake: Steve is not superhuman, but he could see and almost (Diana whips it out of the way first) dodge a bullet at the beginning of the car chase. (01:21:55)
Deliberate mistake: When the tower is looking around with the binoculars, the picture shows night vision. The binoculars were regular. (00:10:30)
Deliberate mistake: In the Spanish release, the name of the family store is written in Spanish, but inside the place it's in English everywhere. This is a very common mistake in foreign kids' films released in Spain.