When the school bus driver steps hard on the brake, none of the children in the bus move forward in reaction to the sudden stop.
After the school bus driver goes all out to reassure the kids the locusts would not get into the bus, he stands by and does absolutely nothing when it is discovered he forgot to close the overhead vent and the children are frantically running about shooing away the locusts that do get in.
The "Welcome to Indiana" signs shown are not located in either Floyd or Clark counties in southern Indiana, where the swarm is reportedly entering. The real welcome signs in these two counties are located at the end of the three bridges spanning the Ohio River between southern Indiana and Louisville, Kentucky.