Wings Season 1 Episode 1

Goof: Although Lowell was definitely around when Joe, Brian, and Helen were growing up, and they may not have known who he was, they don't appear to have known him personally at the time (as Helen's comment "We didn't even know you then" in "This Old House" would indicate). It's hardly surprising that Brian would fail to recognize someone he hadn't seen in years who he barely knew in the first place.