Continuity mistake: At the beginning of the movie, you see that the baby Matilda's eyes are brown, but they change colour to blue when she's in the car.
Suggested correction: It was just the lighting. The sun was shining through the window in the morning.
Revealing mistake: When Matilda telepathically makes the TV explode, you can see what looks like parts of an explosive hidden behind the screen.
Suggested correction: Clearly no sign of it.
Suggested correction: There is no view of the explosive.
Other mistake: The time on Miss Trunchbull's mantel clock is 7:45. Matilda uses her power to move the hands to 9:00 and the clock begins chiming. It should have also chimed when the hands reached 8:00. Matilda then moves the hands to 11:00. The clock begins chiming 11 but failed to chime when the hands reached 10:00.
Suggested correction: We have a grandfather clock and if you spin the hands past an hour mark quickly you hear the click like it wants to play the hourly tune but then doesn't. It only plays if you go just past the hour and stop. Trunchbull's clock may be similar.
Factual error: When Miss Trunchbull gets pushed onto the globe by the boy she just threw out the window, it shows Japan south of Asia. Japan is really east of Asia.
Suggested correction: Japan is shown correctly, with Korea west of the south part of Japan, China west/southwest of Korea, and the Philippines to the south of Japan. You can also see the Russian island and peninsula just north of Japan. It is a real globe.