When Lip is telling Clayton Gallagher and his wife Lucy about doing a family tree project, his voice can be heard, but in one shot he is looking down and his lips are not moving.
Steve twice refers to his and Fiona's flight leaving O'Hare Airport, first when he gives her the ticket ("first class, Miami from O'Hare") and again when he tells her he'll meet her "at O'Hare tomorrow afternoon". But the shots of Steve waiting at the airport clearly show him at Chicago Midway International Airport.