Badfinger's "Day After Day" is on side two of the STRAIGHT UP album so the label should show a cut/halved apple. The record on the turntable shows a green, whole apple, indicating that side one is playing.
Daniela stopped knocking on the front door as soon as Mary Ellen and Judy realized that there was someone at the door. After Mary Ellen opens the front door to see nobody there, Daniela appears, claiming to have been knocking on the front door for 10 minutes and that she entered the house through the back door, meaning that Daniela must have ran incredibly quickly from the front to the back door in the time she supposedly stopped knocking to when Mary Ellen checks the front door.
When Mary Ellen hears knocking on the front door whilst making the cake with Judy, Daniela appears and tells them that she entered the house through the back door even though Mary Ellen clearly heard knocking coming from the front door.
Annabelle Comes Home takes place in 1968 (the Warrens remove her from the nurses' house after interviewing them), yet we see Rory's music box from The Conjuring present in the artifact room, despite The Conjuring taking place 3 years later.
A typo in the credits lists the MPAA certificate for the film as certificate #52101. This is incorrect as the correct certification for the film is certificate #52191. The actual movie with the MPAA certificate #52101 is Rob Zombie's upcoming movie 3 from Hell.
Judy and Mary Ellen do not seem to be aware that the backdoor is unlocked after Daniela sneaks into the house through it and leave it unlocked for the remainder of the film, allowing Daniela and Bob to enter the house later in the film without the protagonists realizing.
When Mrs Faley walks up to Bob at the supermarket, she stands in front of the counter to tell him that there's been an accident. But in the next shot Mrs Faley is standing in front of the door/entrance of the supermarket, in a completely different position to where she was standing in the previous shot.