Attack on Central City - S3-E14
Factual error: Wells states that there are "precisely 90,000" possible 5-digit combinations for the keypad (to abort the nuclear code). However, there are actually 100,000 possible combinations (10^5).
Factual error: The men rowing the longboat into the wharf at Nassau are completely hopeless oarsmen. Needless to say, 18th century sailors would have been expert oarsmen. Untrained 21st century actors are not.