When Madame Odius gets three Ninja Medallions, she claims that the first three Galactic Ninjas are destroyed, despite knowing that Wolvermean and Venoma are still alive.
In the Megazord fight, after the Ultrazord splits apart into the three main Megazords, the Bull Rider Megazord can be seen with the Dragon Zord as its left arm.
When Rygore appears after Brody joins the other Ranger teens following his detention, they're in a parking lot, then they're suddenly in a mowed clearing in the woods, then they're suddenly in the woods itself.
When Brody locks the Lion Fire Zord star onto his Ninja Star Blade, he says "Zord Time" instead of "Zord Star."
The first three Galactic Ninjas always took their medallions from a box before heading out to attack the Rangers. When Madam Odius wants Venoma's medallion, she has to take it from Venoma herself rather than from the box. Venoma hadn't started her campaign against the Rangers and shouldn't have yet been in possession of her medallion.