When Rita heads to Finster's lab, Goldar is seen sleeping on the observatory stairs, but when Squatt is talking about the monster that Finster is preparing, Goldar is seen awake and standing, this being an error through the usage of Sentai and American footage together.
Upon closer inspection of the "cake" in Bily's machine, you can see it is actually an older-style automotive air filter that would be used in older carburetor engines.
After Zack morphs, the Power Axe is smoking and corroded before having made contact with Knasty Knight's sword.
The band at at the surprise party could not possibly be playing the music that is heard. The vocals are clearly by a female, and the band is an all-male trio - with no one singing! Furthermore, some synth/keyboard-type instruments can be heard, which the musicians clearly do not have.
When Knasty Knight is blasting at the Black Ranger, on top of the hill to the right there appears to be two people tied up to poles even though Rita was not holding anybody hostage.
When Kimberly opens her locker, a hand can briefly be seen holding it open from below.
Zordon's voice sounds different than in other episodes.