Corrected entry: Assuming that in Series 2, Zordon gave permission for (before they were Rangers) Rocky, Aisha, and Adam to enter, Goldar and Rito shouldn't of been able to go into the Command Centre. Thoughout the series, it has been stressed that no-one enters the Command Centre without a Power Coin - this was even one of the subplots of Green with Evil, in Series 1.
Corrected entry: Season 2 had a two part episode called "The Power Transfer" where Jason, Zack, and Trini transferred their powers to three new rangers. To do this they needed some special sword on a far away planet. So how come Kimberly didn't have to use the same sword to transfer her power coin to Katherine?
Corrected entry: Billy tells Tommy that he can use his Portal Opener to rescue Kimberley from the Dark Dimension, where Tommy once was. There are a few mistakes here. 1) The Portal Opener is completely different to one used in Series 1. 2) The first time it was used, it was to go after the Green Candle, which was stealing Tommy's Green Ranger powers. Tommy was never trapped in a Dark Dimension. 3) Kimberely is in Lord Zedd's Dark Dimension, not Rita's. (Which is where the Green Candle was). The Dimensions are completely different.
Corrected entry: When Master Vile's monster drains power from Ninjor, we can see that some of Ninjor's appearance transfers over the monster. When the monster does this to the Rangers however, the appearance drain matches of the Aquitain Rangers (Who had not yet come into the series). This is because Saban had carried over the costumes from the previous series, so that all 6 Rangers could remain (Due to their only being 5 Aquitain Rangers).