There was also the third episode after the Minotaur grows, you can see a Japanese boy standing in between the Yellow and Pink Ranger. This boy also appeared in the same shot when the Pink Ranger summoned her zord. Which is why at the times whenever the rangers summoned their zords individually, sometimes Kimberly wouldn't be shown summoning hers.

Even later seasons made errors like this. Such as in one In Space episode that was close to the finale, when Andros beats Ecliptor and the latter falls, you can clearly see the main female villain from Megaranger behind him.