Sam: Part 1 - S1-E7
Other mistake: When the Ranger first yells "SPD emergency," a piece of Jack's Morpher breaks off.
Other mistake: When Cruger is challenged to defeat 100 robots, a red countdown meter appears on the screen, ticking down each time Cruger dispatches an opponent. When the counter is at 21, Cruger slices his sword at a robot, which then goes down. But the counter stays at 21 and only goes to 22 when he slices at the next robot. Every robot in the sequence goes down after a single hit from Cruger's sword.
Other mistake: How could Jack know that Cruger deliberately refused to help Rangers during their first battle with Drakel? He couldn't have known what was happening on the other side of the morpher.
Recognition - S1-E17
Plot hole: Bridge could have used his powers to figure out if Wootox and Sky's bodies were still switched.