Laurents added: ''Matt hits notes Larry Kert couldn't"
There's only one such note. The long held high Bb in "Maria." (The score includes the optional line that Kert sang, which only goes up to an A - an option many other actors have sung as well - even though the Bb is more impressive, and IMO, actually easier than the alternate line.) Otherwise, Kert sang everything as is, as far as I know.