Heart of Ice - S1-E3
Other mistake: When Batman is watching the security footage of Victor Fries' accident, at first Fries is addressing the camera directly which follows him and pans according to his movements and Ferris Boyle interrupting him, which would suggest a second person was in the room with a handheld camera. But after Ferris Boyle enters the room and orders Fries' experiment terminated, there are several cuts from various angles in the room suggesting surveillance cameras. The surveillance style footage also often conveniently cuts to the face of whichever person happens to be speaking or will cut to a certain angle in order to put emphasis on the action, all of which would require multiple mounted cameras and purposeful editing by either Boyle or one of his subordinates, which would be completely illogical since they don't want anyone to see the footage in the first place. (00:12:20 - 00:13:55)
Other mistake: After helping Longshot in the alley, Jubilee tells Logan "Are you blind? He's on our side!" to which Logan responds "We don't know that." This dialogue is repeated verbatim when the Professor meets Longshot. In addition to being obviously re-used vocal lines, the context of Jubilee asking "Are you blind?" doesn't make much sense the second time.
Other mistake: Jake Hansen (Grant Show) wears a gold wedding band on his left or hand during the shows run, when he's supposedly single.
Suggested correction: Not really a mistake, just a character choice. Grant Show wasn't married at the time, so it's not his wedding band we see, it's just a ring.
Who Burned Mr. Brinker's Store?: Part 1 - S1-E6
Other mistake: The arson investigators name Jamal as the main suspect in setting fire to the store, because the security camera caught him sliding something through the front door mail-slot. Any arson expert would immediately know that it wasn't Jamal that started the fire, as the fire's point of origin was in the back of store, and was also entirely contained there, and Jamal was not only nowhere near the back of the store, but was also outside.
Other mistake: Nick pronounces the plastic surgeon's name as "Yergen" in one scene and as "Jergen" in the next. At the end, she becomes Dr. "Yergen" again. (00:29:40 - 00:31:10)
Other mistake: Nefertiri has been buried for almost 2000 years, yet speaks perfect modern English.
Other mistake: Throughout the episode, characters make reference to Mark's Grandma having a wooden leg, including the woman herself. However, both of her legs are visible from the knee down several times in the episode, and you can see both of them are flesh and bone.
The Patience of Maigret - S1-E1
Other mistake: A newspaper headline reads "MAIGRET tient t'il enfin le tueur?" This makes no sense in French. It should read "MAIGRET tient-il enfin le tueur?" ("Does Maigret have the killer at last?"). (00:27:55)