Revealing: The beer bottle behind John Goodman in the picnic scene is a modern day Budweiser bottle.

Continuity: In the scene where Everett finds his wife in the Woolworth's, he pulls her off to the side to have a private conversation. You can see the twine that connects her and all her children start to stretch out as she walks away. In the next shot, as she is walking over to Everett, the string is gone.

Plot hole: Near the beginning of the movie, one of the characters states that it is the 17th and the valley would be flooded on the 21st. Yet, throughout the movie, there are too many nights that go by for it to just be the few days when the valley finally floods.

Factual error: In the scene where Everett and company enter the radio station, Everett asks 'Who is the honcho here?' 'Honcho' is derived from a Japanese word for 'group leader' and did not enter American slang until after World War II, by way of Allied occupation forces in Japan.