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)
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.
Answer: He has seen himself dancing, and is mortified at how bad he looks.