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: Throughout the series, the Rangers' morphing has been instantaneous. Anyone who has ever been in a photobooth will know that they take a good minute or so to get through all 4 photos (which is what Sophie picks up) - it has never taken Carlos, or any Ranger, that long to morph.
Continuity mistake: This can only be seen for a few frames, so slow motion may be needed. Tommy reveals himself as the White Ranger by unclipping his helmet; however, his ponytail is already visible. Tommy's hair should have been inside his suit/helmet if he had just unclipped it. From behind shots, it is tucked in.
Continuity mistake: When the Gold Ranger calls upon his Golden Power Staff - first, his hand is at the top of the handle, right below the emblem. In the next shot, his hand is at the bottom of the handle, away from the emblem - there isn't enough time for his hand to drop.