“Ezra” (** out of four) was an earnest but scattershot melodrama about a comic (Bobby Carnavale) and his complicated relationship with his young autistic son (William A. Fitzgerald), his ex-wife (Rose Byrne), and his bitter father (Robert De Niro). Good intentions abound in this story which is well-served by a first-rate cast but never connects emotionally and never gets off the ground as a comedy or family drama. Director Tony Goldwyn has a small role as a doctor.