Continuity mistake: When Phil tries to get his bike down he falls over. A lot of stuff falls from the shelves behind him, when Claire asks if he is okay and Phil answers "Yes I am" you see that the shelves behind him are a mess. But the next shot you see that all the stuff is cleaned up again. In the next few shots the background changes all the time. (00:01:00)
Revealing mistake: While Phil and Claire are racing each other to Manny's birthday dinner, each car goes around corners, but the steering wheels are never turned.
Dance Dance Revelation - S2-E10
Revealing mistake: When Lily hits Mitchell in the face, her 'arm' is covered by a pyjama-like material, but the next shot shows her wearing a sleeveless dress, showing her 'arm' was really a padded stick.
Boys' Night - S2-E18
Other mistake: In the opening scene, the Dunphys are playing ball in their backyard when Claire knocks it into their crotchety old neighbour's yard. They all head in, and as Phil explains to Luke that it's because it's their only ball, another ball is in the grass visible over Luke's shoulder.
Continuity mistake: When Jay is talking with his brother and finds out about his brother's cancer, he is holding a glass of scotch with a tiny bit of ice. When his brother approaches him the glass now just has ice with no scotch. We don't see the glass for a short period before he is about to sit in his chair and spills the contents of the glass, which now has the scotch and ice again.
Visible crew/equipment: When Manny holds up the Phantom mask to Jay's face and realises it's for the wrong side, as Manny rushes back upstairs for a lefty, the reflections of the Steadicam operator and crew are visible on the minivan's surface, beside Gloria. (00:14:40)
Answer: He has seen himself dancing, and is mortified at how bad he looks.