Continuity mistake: When Mrs Durant is swatting the bees off the table at the picnic site, you can see Mr Durant is holding a white plastic cup in his left hand. However, in a close-up of the table, you can see that the cup Mr Durant is holding has gone.
Continuity mistake: When the Marysville residents begin panicking in the carriage during the train evacuation scene, you can see that Olivia De Havilland isn't wearing her reading glasses, but in the next shot she has glasses on and takes them off again.
Continuity mistake: When Paul's mother is using a napkin to swat the bees off the table at the picnic site, she knocks over a white plastic cup, but when we see a full view of the table in the next shot, the cup has disappeared.
Continuity mistake: When a larger group of soldiers enter the compound at the beginning of the film, the door of the compound opens to let them inside in one shot, but in the next shot the door is closed and opens a second time.
Continuity mistake: The burnout of Houston takes place at nighttime, but when the bees attack an ambulance driver who then crashes into a building, the scene changes briefly to broad daylight.