Revealing mistake: At the very beginning of the episode, we see a hydrocharge being fired which causes an explosion in the sea. Then just a few shots later, another hydrocharge is fired and we see the same explosion - this is due to footage of one explosion being used twice.
Continuity mistake: After Troy finishes talking to Phones about if the ice is a trick, we cut to a shot of Stingray trapped in the ice. Later on in the episode, when Phones pulls the gear lever in an attempt to move Stingray from the ice, he says, "We're iced up!" and we cut to the same shot of Stingray trapped in the ice as before.