The Krakken - S1-E3
Continuity mistake: When The Krakken snatches the Cannery crate from the boat, you can see that the lower horizontal bar from the 'E' is suddenly missing, thus reading 'Cannfry'.
The Krakken - S1-E3
Continuity mistake: When Ben pretends to be sucked into the lake, and Gwen turns around to look after him saying "I'm not falling for it", she's missing her eyebrows for a second or two.
The Krakken - S1-E3
Audio problem: When the kraken roars, when it destroys a ship, it sounds like a TIE fighter in Star Wars.