In Back to the Garden (2004), Joan says that she was watching The Nutty Professor (1996) when the police came to the door about Kevin's accident. In a flashback to the actual night in this episode, she is watching The Three Stooges' short Men in Black (1934).
In Pilot (2003), it was mentioned that it had been eighteen months since Kevin's accident. However, that episode took place in September 2003 while this episode gives the date of Kevin's accident as November 9, 2002.
When Grace kisses Luke after having torn up their contract she is holding onto his head with both hands but in the next shot she isn't.