Revealing mistake: The captain's arm that was removed can be seen wrapped in a green screen editing sleeve when he is in the hospital. (00:39:55)
Revealing mistake: When Johnny shows up to Cobra Kai dojo and all the kids are there. In the video playback they show on the phone you can see Miguel didn't land the kick, and the kid just fell down. (00:28:18)
Revealing mistake: In the sequence with Zeus and Apollo attacking the intruders, the padding of the jackets' arms they are sinking their teeth into is very noticeable. (00:32:15)
Revealing mistake: Driving through Paris, the speedometer of the Police BMW car is at 0kph (rev counter shows car at tick-over).
Revealing mistake: When the assistant gets thrown into the wall by the brain controlled Gar-tiger, there are already marks on the point of impact, from previous takes.
Revealing mistake: When Mitsuhashi and Ito meet on the first day of school, the clock in the classroom never advances from the 8:20 position despite the scene taking place in a span longer than one minute. (00:04:45 - 00:06:08)
Revealing mistake: When Eugene receives his return orders, not only is it from the wrong Roosevelt, but above the Eagle, it says the "State" of Washington rather than being from Washington DC, which is not a state. (01:08:16)