When Bobby goes out, April is shown with a bandage on her finger long before she actually cuts it.
At the end of the film, when the snapshots are shown of April and her mother hugging, April is wearing a pink sweater. In the very next shot of Joy's face April is not wearing the sweater.
Joy's wig is wet after she rinses it in the sink. Presumably a short time later, the ride continues, but Joy's wig is completely dry.
The camera Timmy is using is a modern Nikon autofocus SLR which has an electrically controlled self-timer that doesn't make any noise during operation. When April's mother, dad, grandmother and sister stop at the Christmas shop and at the very end of the movie the sound of an old manual self-timer is inserted in the sound track.