Goofs

The stone in front of the barn appears and then disappears.

The horses are shown turning right at one point during the race. All turns on the Grand National course are made to the left.

In the book, the Pie, was short for piebald, an English term for black-and-white horses. The Pie was discriminated against in the book because of the piebald color.

The Grand National is over fences. The jumps in the movie's version of the race are hurdles.

The story takes place in the late-1920s, and the Browns pay the entry fee with "100 gold sovereigns" which ceased to be used as money in England in 1918.

However, this is consistent with a detail from the novel, in which Mrs. Brown insists the entry fee be paid with the sovereigns she won swimming the English Channel, which occurred prior to 1918.

In this story that is set in the 1920s, the female fashions and hairdos are clearly from the 1940s.

Mr. Brown, a butcher who should know better, authoritatively announces that one small-to-medium-sized lobster will provide a family dinner for six: a claw apiece for him and his wife, the entire tail (the meatiest part of the crustacean) for his picky young son who's a finicky eater and what's "in-between" (basically all of its inedible entrails) for his three teenage daughters - with some left over for the dog! In reality, a lobster of that size would hardly feed one hungry person.

When Mr. Brown throws the letters on the fire, they land in such a way that the fire would progress along them to the carpet and so set fire to the house.