Hopkinsville - S2-E4
Other mistake: Mr. Shoemaker tells Dr. Hynek and the Captain that the aliens he saw had three-fingered hands. A short while later he is caught giving a description of the aliens to a reporter. The picture drawn - based on Mr. Shoemaker's description - shows five-fingered hands. Plus later Dr. Hynek discovers a bio-luminescent hand print on a tree. It shows four fingers. (00:10:55)
Suggested correction: This is proved as a hoax so what the man said about the alien having three fingers could just have him mis-remembering the hoax details.
I can see that. OK.
Other mistake: Dr. Hynek and some Men in Black are aboard a boat. There is loud music playing. When Dr. Hynek tries to turn the radios off, power is cut off aboard the boat, leaving it in darkness. When they want to use the electric winch to raise something, the winch works. If there is no power, what allows the electric winch to operate? (00:26:15)
Broken Arrow - S2-E9
Other mistake: Before the downed airplane pilots were identified as Russian they spoke perfect English. No accent. The minute they were identified as Russian they began speaking English with a Russian accent.