During the end credits, the amount of milk in Michael's glass keeps changing.
When Gina says she's never lived alone, Joey declares he hasn't either. But in Season 2 of Friends (1994), his success on Days Of Our Lives led to him moving out on his own for a while, starting with The One Where Joey Moves Out (1996) (where this event is even the title). This event even led to owning the white dog statue which was a frequent prop for the rest of the series.