We've seen Elvis as the racecar driver, millionare texan, boxer (kid galahad), convict, hillbilly (kissin' cousins), dumb hilbilly again (follow that dream) Now we see the Tourist Elvis singing his way through England (although it's really Belgium, I'm told.)
Elvis is actually at his best when he is glib and cynical. In those instances his acting is really quite good in a comical way. Sort of like the wisecracking Jim Rockford of Rockford Files. When he tries to get serious, in most of his films, he appears wooden and scripted. This is not a bad Elvis movie, mostly due to the funny antics of the bumbling detectives following him, and Elvis' more relaxed acting style.
The fact that he breaks out in a song at the drop of the hat in some of the corniest situations doesn't matter. After all, it is an ELVIS movie.
One thing that baffles me is the title. Why DOUBLE trouble? Did I miss something? OK I think i get it.. 2 different women causing him trouble?...