A common theme throughout the Insidious films is that the dead and other spiritual entities will try to trick you. During the first movie, Josh learns that he used the astral project (his soul left his body) when he was a child, just like his son is doing now. When someone does this, it leaves their body open for spirits and demons to take over, and that’s exactly what happened to poor Josh.
As it turns out, Josh was haunted by the ghost of an old woman dressed in black (Philip Friedman). She tried to befriend and manipulate him into leaving his body so she could steal it and live again. When Josh enters the Far (where the spirits live) to rescue his son, the old woman returns and invades his body. When he wakes up, everyone takes him for who they seem. However, the picture reveals the truth. The entire second movie is dedicated to proving that Josh is possessed. Similarly, there is a creepy moment in the sequel when Carl discovers that he is not actually talking to Eliza’s spirit.
In “Chapter 3” there are two cases of misidentification. First, Quinn thinks the spirit she is referring to is her mother. However, in reality, this is a man who cannot breathe, trying to lure her into the Far One so that she will live with him forever. In The Last Key, one of Eliza’s nieces (Spencer Locke) follows her father’s voice, only to encounter a demon that dwells in the basement. In short, when dealing with a ghost, be absolutely sure who you are talking to.