During the fight with Robogoat, after Jason the Red Ranger tells the other Rangers to stabilize the servos of the Thunder Megazord, there is a shot of the Thunder Megazord being hit and taking heavy damage from Robogoat's energy blasts. However, in the next shot, the blasts hit the original Megazord instead of the Thunder Megazord.
When the Green Ranger is down in the dirt weak from power loss and trying to summon the Dragonzord, you can clearly see through his visor revealing the stunt performer's face.
After the zords are summoned but before they form the megazord, the yellow griffin zord makes the sound that the blue unicorn zord makes.