Continuity mistake: Up until Green No More in Series 2 (where the Green Ranger powers are destroyed), the Green Ranger's overshield constantly changes between solid-looking metal to flimsy-looking cotton. This is the most obvious difference between the Japanese and US footage.
Continuity mistake: When in Tank mode and Megazord mode, the order in which the Rangers sit is: Billy, Trini, Jason, Kim, Zach. When switching between Tank mode and Megazord mode, Trini and Kim are switched - they are then back to their original seats once the Megazord has been formed.
Continuity mistake: When the Rangers find Uncle Howard tied to the bombs, Howard asks "Did he tell you about the bomb?" then we see the clock counting down from 18 seconds. A few seconds later, Billy is being encouraged to deactivate the bomb. We get another view of the clock with Billy's hand trying to deactivate it, and the clock is counting down from 18 seconds again. (00:11:55)Justin Davis