In Brief: In the live action series the attack was renamed, Mercury Aqua Mist which looked identical to Mercury Bubble Blast but resulted in a bubble energy beam rather than a mist. This was most likely due to the special effects budget of a weekly television series. So while Mercury lost a defensive attack, she gained an offensive one that allowed her to take out bad guys all by her self!

Cultural: "To see bubbles in your dreams, represent merriment, fun, and childhood joys. It may also symbolize wishes or unrealistic expectations. In deciphering this dream symbol, consider also the phrase of "bursting one's bubble".

To dream that you or someone is taking a bubble bath, represents ultimate relaxation. You have rid yourself of your worries/difficulties and release all the negative emotions you have been keeping inside."

~ BrilliantDreams.com

The Attack: For the live action series attack, Sailor Mercury's bracelet begins to glow, she opens her arms and begins to spin around like a whirlwind drawing in all the air, in this case water and bubbles. Lights flash and she continues to spin. When she has caught enough water/bubbles she stops spinning and fires the bubbles at her target by slowly drawing her arms together.