Josette's tombstone reads 1774-1795. In an earlier episode (before Vicki's travel back in time), her tombstone reads 1800-1822 (which wouldn't make sense anyway as she wouldn't yet exist in the 1795 time line).
When Barnabas raises Josette from the grave- for some reason she is wearing a wedding dress. Rather strange pick of clothing to be buried in.
When Natalie and Abigail are looking out the window you see some green ivy growing on the outside wall (which wouldn't be possible during a New England winter). You can see a line of string that is holding the fake ivy to the wall.