When Judy and Frank are at the movies, most of his popcorn goes flying onto the couple sitting behind him but in the next shot the bucket is full. Her popcorn level also changes.
During Mr. Todd's song near the beginning of the movie, the classroom clock changes back from 8:35 to 8:33.
After the Bigfoot believers drive through the baseball pitch,their van crashes into the fence. However in the next shot they crash into the fence again.
When Judy and Frank make their tightrope, it hangs down loosely. When Judy climbs up onto the rope to walk across, the rope is very tight with no sag. Then Frank climbs up to join Judy, and still not very much sag. After Judy and Frank fall off, the rope is now tied so loose that it comes untied and falls down into the water.
When Judy tells Opal that she hasn't got any thrill points,the dogs chase Bigfoot outside. She spots Bigfoot running and she runs to the window. Bigfoot runs past the window again.
The movie theater usher should never ask to see the ticket again if a customer goes to a concession stand or the lobby or to the bathroom and goes back in the theater room.
When Jessica Finch rides by the station wagon on her bicycle, the camera's reflection passes over the automobile's windows.