Corrected entry: When Annie is telling her mother about how she and Walter met, she says they each got each other's sandwiches: Walter got her sandwich on whole wheat bread, which he was allergic to, while she got his on white bread. However, anyone allergic to whole wheat bread would be equally allergic to white bread; wheat flour is the main ingredient in white bread.
JackieN
3rd Dec 2006
Correction: Dead wrong. A friend of mine is allergic to whole wheat but not wheat. Whole wheat flour contains wheat bran, white wheat-flour does not.
JackieN
But later, at the New Year's Party, when Walter and Annie plan to meet in NY for Valentine's Day, Annie says "I'll take you to Chinatown for DimSum" and Walter asks "is there wheat in that?" which implies that he is allergic to wheat. So there is definitely a mistake.