In the second season after Serena gets her new power they repeatedly use "Moon Prism Power" or "Moon Star Power" even though she's supposed to say "Moon Crystal Power"
When Serena is having her bath the water is shown to be a red
translucent color, you can clearly see through . In the next seen it is revealed that Rini was hiding underneath the water, however because you could so clearly see through it before there is no way Rini could have hidden there.
Serena and Darien are dating and are married in the past in the moon kingdom but they are 6 years apart. All the Sailor Scouts are 14 and Darien is 20.