Elvis Presley performs "Return to Sender" in the club. It would be his final UK and US chart topper from a movie in which he starred.
According to "The Book of Lists 2" by Irving Wallace et al., this was the most widely televised of all Elvis Presley's films.
When Ross and and Laurel walk outside the Pirates Den, two Blue Hawaii (1961) movie posters are visible.
When Elvis Presley is performing "Return to Sender", Jackie Wilson was on the set that day. He actually was in the audience of the bar/club in the film.