Continuity mistake: When the Rangers first morph, they engage in a battle with Goldar. When in this battle, Trini gets a black burn mark on her suit, which promptly vanishes. (00:09:50)
Suggested correction: This was a common occurrence during the entire run of the show, and it was theorized that the suits had an ability to self-repair to keep the Rangers from more harm. The only Ranger to never sustain damage to their suit was Tommy, since he had the Dragon Shield to protect him.
Yes, it's a common occurrence throughout the show, but normally it shows damage until the end of the battle/morph sequence. In the mistake listed above, the damage disappears between camera cuts in the middle of a fight sequence.
In the final battle between the Red and Evil Green Rangers, Jason shows a black impact mark on his chest, but it's gone in the next shot; maybe the suits do self-repair.
Leap Frogs / Bedfellows - S1-E2
Continuity mistake: Leap Frogs: When Rocko is on the stool trying to screw in the light bulb, Bev walks up to him and screws it in, powering it on. In the next shot, the light bulb is suddenly off again. (00:05:47)