After Greg leaves his fiance's house after getting in trouble with the cat business, he schedules a ticket for Chicago to leave from La Guardia airport. If you notice when he's waiting to get on the flight, the waiting area is not LaGuardia airport but White Plains airport. I only know this because I've been to White Plains Airport, and the model airplanes hanging from the ceiling are a dead giveaway. Not a huge mistake, but they could've taken the planes down or something.