There are numerous irregularities between the 2 versions of the same phone call (shown in the beginning and in the middle of the episode) between Abby and Samantha such as, when Abby throws the mug to the door, in the first version it hits the left part of the door and in the second it hits the right.
When Abby throws the coffee mug it hits different doors. First flashback on the left door, second flashback on the right door.