Joan Rivers is fuming over an “idiot woman in Costa Rica” who bounced her from a flight home to New York because the comic’s passport read, “Joan Rosenberg a k a Joan Rivers.” Joan explained her late husband was Edgar Rosenberg, but the officious official gave her seat away, making her wait for a flight out the next morning. Finally home in her Upper East Side apartment yesterday, Rivers told us, “If I was going to have a fake passport, I would never pick the name Rosenberg.”