Character mistake: Rodney says that one hour in real time would give them months inside the field. This is incorrect because if the ratio of time were 1:250 as stated before, one hour would only convert to 250 hours, which is 10 days and 10 hours.
Character mistake: Throughout the whole series Jin and Sun refer to each other as "yobo." The subtitles continually translate "yobo" as either "Jin" or "Sun" which is incorrect. "Yobo" is Korea's version of "dear" or "sweetheart."
Character mistake: In s01e08, "Q and A", Yelena moves her bishop to B6. The announcer says that's going to win it (the game gets interrupted at this point). However, that move does not put the computer (her opponent) into checkmate, it doesn't even put it into check. Her bishop is on a dark square and the computer's king is on a white square.