In order to get into the mother's house, Linda Holt shoots three holes into the front door (near the handle). When she swings the door open and enters, they are no longer visible.
During the shootout in the nursery, the guards fire their revolvers too many times without reloading.
For some reason, neither the police nor the coroners pay attention to the nature of the dead nanny's wounds.
The initial examination of the murder scene involves a description of the external condition of the corpse with the presumed cause of death, so someone should have noticed that the girl died from baby bites.