The dreamy firemen saw Wanda in fairy form. However it is possible that the firemen thought she was a caveperson who had invented a way to make herself fly without the support of things like wings or a glider.
Whatever happened to the other people on the island?
If the lockers were fingerprint opened, wouldn't the school have to take the fingerprints of students? If they did that, Timmy would've known about them, but he didn't, so the lockers weren't registered and couldn't have been opened either way. Also, it's weird to have denied access just because of a dirty fingerprint. It's even weird how the intruder prevention system was activated after having denied access once.
When the house lost electricity, it includes Timmy's desk clock. But clocks are battery-powered, so this is impossible unless it was plugged up and the backup batteries were dead.
When Timmy greets Chester & A.J. in the treehouse, when Cosmo says it's a turbulent flight. the captions spell "Jimmy" in place of "Timmy".
In the prehistory exists more animals like gorillas or parrots, so why don't Mr. and Mrs. Turner kill animals to get food?
Also, Mr. Turner invented the hunting that is killing animals so why didn't he go to home with the dead animal to cook it in fire?