My mom is a HUGE Elvis fan and her fave movies are Blue Hawaii, Paradise Hawaiian Style and GI Blues. I personally like Jailhouse Rock the best.
Back in the early 90's, did anyone here see that "Elvis: The Concert" show that toured? It was his old touring band and backup singers from the 70's playing live and they had a video of Elvis on these big screens above the stage (from some shows he did back then like Aloha From Hawaii, etc) and he actually "interacted" with the band. They recorded those old shows on a multi-track tape so all they had to do was extract Elvis' vocal track and play that alone with special cues for the band to know what song to start playing and when. It was really interesting how they pulled the whole thing off.