When Geoff and Erica are talking to Murray, from behind, Geoff is wearing a short-sleeved purple shirt. When it switches back to Geoff, he is wearing a long-sleeved purple shirt.
Takes place the first week of March in Pennsylvania (which is still winter), but during the opening outdoor scene where Bev is having Jeff and Erica rehearse for the wedding, the grass/trees/bushes are all fully green. That would not be the case so early in the year.
On the television the weather man shows a map with where the storm is. A freeze frame would reveal the storm is directly above WESTERN Pennsylvania and is actually nowhere near Philadelphia.