Continuity mistake: In the end, when Michael has grabbed Karen's ankle and is trying to pull her down into the basement, Allyson grabs a knife off the floor and stabs him. However, if you watch very closely, you can see she's already holding the knife in one shot before she grabs it. (It's the shot right before Laurie screams "I've got you!" to Karen.) You have to pay attention because it goes by quickly, but you can see Allyson lifting the knife into frame for a split second, even though she doesn't pick it up off the floor until about 15 seconds later.
Continuity mistake: Towards the end when Laurie and her daughter are in the basement, they look up to see light coming through the wood floor and see Michael's shadow. But in all the shots from the first floor it is a tile floor with no spaces for light.
Continuity mistake: During the scene when Aaron is pumping gas, the display on the pump is blank. When he's finished, the display suddenly shows the amount dispensed and the amount due.
Continuity mistake: When the podcast guys go to jail to visit Myers, the shadow he casts keeps swapping from pointing to a 12 o'clock direction to a 2 o'clock. This changes back and forth.
Continuity mistake: As Aaron and Dana drive to their meeting with Laurie Strode, the recording device Aaron holds in his right hand changes position several times as the scenes quick cut.
Continuity mistake: While Aaron and Dana walk on the esplanade of the house, the sun on the floor changes between shots.
Answer: This is meant to be ambiguous on purpose. We are not supposed to know how he got out... if he got out.
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