At the end of the movie, a policeman buys a six pack of local Texas beer, the bottles of which are dark brown. They remove the six pack from the brown bag and put it on the table. After Doris Knight talks for a while, the beers become the Dutch import Heineken, and the beer package seems to be back in the brown bag again.
At the end of the movie, when those two boys got out of the house, they were just wearing white tube socks, and they were walking on muddy surface. After a while, they somehow were wearing rubber boots. And when they were sleeping in the policeman's car, their white socks look clean without any mud on them.