As Heather approaches the table where Max, Charlie and Mrs. Kessler are sitting, we see a lightning strike. As the flicker of light briefly comes back, we see Heather jump to another position in the room.
When everyone is at Shecky's house, the photo of him and his mother changes position on the end table multiple times.
When Charlie and Max are having their first breakfast in their home, the large sausage on Charlie's plate changes position multiple times.
When Max shows his fake Georgia Driver's license to the banker, the city reads "Brunswich". It should actually say "Brunswick"
When Becca and Heather are fighting at the end, Becca jumps off the 2nd floor deck and lands on Heather, who is on the street. When they both get back up, they are on the deck again and have a fight where they fall down the stairs back on the street.
When Max and the gymnast are in the wine cellar, the cables from the battery disappear when the gymnast does a backflip to avoid the wine barrels and then they reappear when he sticks his landing.
When Charlie was carrying the Chinese takeout to his front door, it's obvious the bags are empty.