When Samantha first meets Nellie and her sisters, as she is leaving to go home she she says, "Goodbye Nellie, goodbye Bridget, goodbye Jenny." Nellie replies, "Goodbye," then the other two say, "Goodbye," simultaneously however in the story Jenny doesn't speak.
When Samantha hears Uncle Gard's horn, she starts running home but turns around to say goodbye to Bridget and Jenny, then continues to run towards Uncle Gard. The next shot shows Samantha has not yet passed Bridget and Jenny even though the previous shot shows her turning around revealing that she has already passed the two girls.
After Samantha defends Nellie and the girls against Eddie, Eddie is called by his mother to run an errand for her. Soon after he leaves, Samantha returns home and begins practicing piano but when she looks out the window she sees Eddie running around in his backyard with a kite. There is no way Eddie could have done the errand and returned home to run with a kite between Samantha leaving the Ryland home and returning to hers.
When Samantha returns home after defending Nellie and the girls against Eddie, she is practicing piano and when she looks out the window, she sees Nellie walking across the lawn with a basket of laundry while wearing a black dress and white apron. There is not enough time between Samantha leaving Nellie and her practicing piano for Nellie to have changed and begun her chores.
Also, as she would have been new, the housekeeper or head maid would have gone over with her what she was to do and therefore she would not have headed straight into chores, making it even less likely for Samantha to have seen her working while she practiced piano.
When Samantha, Jenny, Nellie and Bridget are all running from the orphanage, who was in front changed between shots. When they first leave the orphanage, Samantha and Jenny are in front but in the next shot they are behind. This continues through the scene.