Amen to the original peeve, overdecorating The Star Spangled Banner--and for that matter, any other song. Are Whitney Houston, Mariah Carey, et. al. incapable of simply singing notes as written, sans embellishment?

Performers who tell the audience "This IS a singalong," as opposed to "You're welcome/encouraged to sing along."

Songs in a session done in variable time (slow down here, speed up there--not talking about songs with intended tempo shifts).