Singing and dancing:
Songs are sung live.  The best "To A Brand-new world".  La Moon is the final battle song.  Over the Moon is sung live and by all the senshi

Important Actors:
Anza and Morino Ayako (First Stage Moon and Mercury).  Kotani Misako as Mars for the rest of the First Stage.  Takeda Keiko as the First stage Saturn (except for in Eien) and Saitou Rei as the first stage Pluto (except for the first Pluto who was never on tape).

The Senshi in this musical are known as the Moon Lips.  They sung the opening song to the Sailor Moon anime for the S and Super S season I think

Mochizuki Yuuta plays Tuxedo Kamen, King Endymion, and Dracul.  He also was Kamen Rider J and Tyrano Ranger in Zyurangers.  He's also one of the F4 in Hana Yori Dango

Kasahara Ryuji plays Tiger's Eye as well as a million other enemies in Sera Myu as well as Silva in the HxH Musical

Enomoto Yuuta does the voice of Pegasus, he also plays the Shin Densetsu's Tuxedo Kamen

Introduces Hikari Ono as Hawk's Eye, this super actor also plays (Shin's Hawk's Eye, the original Star Maker, Loof Merrow, Bloody Dracul Vampiru, and Prince Demand (all in the Sera Myu).  She also does other stuff like her self produced Nazo no Punk Lady and Ninja Yell

Bad:
Jokes aren't as funny as in the original, lost some special effects

Good:
Introduces some very important Senshi.  The ending is a lot better than in SMSS.

Bonus: