Ms Wardwell talks about her amnesia, caused by the possession of Lilith lasting 3 month. But she got possessed at the end of October, and the whole Satan Reborn thing happened after February, Valentine's day, and if followed the Jesus-parallel properly, ended at the end of March (24th being the traditional resurrection-date), so it should be 5 months.
The whipped cream on the gang's milkshakes changes size and shape between shots.