Carl's camera flash is barely discernible in shooting the ape-man in the alley (towards the camera), but later it's quite bright as it shoots downward at the contents of a canister in a lab.
Carl makes a joke about drilling so far north that penguins would need thermal underwear. Penguins only live in the Southern hemisphere.
The large world map on Kitzmiller's wall is very accurate except for one bizarre error. There is an enormous contiguous land mass connected to the northern part of Canada that doesn't exist. For some reason, all of the numerous islands that make up the Northwest Territories were conglomerated into one large mass that looks very out of place for the Arctic north.
The side of meat is a lightweight fake, although the actor strives to make it appear heavy.
At approximate 35:45, when Kolchak enters the biology schoolroom the crew member's hand is visible opening the door at the far right edge.
When Kolchak goes to visit Helen Lynch in the hospital in Springfield, an establishing exterior shot of the hospital contains a palm tree. Palm trees are found in areas with tropical and subtropical climates, not in Illinois.