The date the ghost wrote on Melinda's bathroom mirror was the date this episode aired, September 29th.
Delia walks into Melinda's shop asking if she's open, although a sign next to the door can be seen on the inside of the store saying "open," which would mean that from the outside the sign says "closed." Shouldn't she have read the sign before walking in? And shouldn't Melinda have either locked the door behind her since the store is closed or flipped the sign over to show that the store is open?
Jennifer Love Hewitt and Lacey Chabert previously worked together in Party of Five
Jim: (to Melinda) Well, you and this guy, is there...I can't believe I'm asking this about a ghost. Is there still somethin' between you?
Melinda: Kyle, please don't walk away. Talk to me.
Kyle: Yeah, maybe when I'm dead.