IMDb's lips are sealed - or not so much

First of all, to follow there are SPOILERS (obviously), so stop reading this if you intend to watch this and haven't already. More importantly, whoever set up the infopage for this title on IMDb is a flaming tuckfard because just by checking out the front page (as many people often do without reading any comments before watching) to see the name of the star of this film (and whom the star portrays) ruins the twist completely! I happened to be one of the idiots who got spoiled just by clicking on the title to see the general info; thanks a lot IMDb!
Having said all that, this is obviously heavily inspired by http://www.imdb.com/title/tt0114814/ and http://www.imdb.com/title/tt0109456/?ref_=nv_sr_1 (which I'm not going to call a blatant rip-off, like I've know some people feel is the case, but rather that this is a heavily inspired story of the same genre instead). At least the titlepages for those two films don't spoil the whole damn thing by revealing the twist right at the top of the credits list.
The movie itself is not bad. I think I can honestly say, however, that I wouldn't have been fooled by http://www.imdb.com/name/nm1146916/?ref_=tt_cl_t2 as a boy if I hadn't been spoiled. There were so many hints and clues (mannerisms, the lack of an Adam's Apple, the heavy clothing, hand gestures, lip movement, and the voice). This could fool someone for a few minutes or a day, but I think that's as far as it would go.
Anyway, it was a pretty decent film altogether, and I really like the mystery genre with a twist (especially when the films are ambitious and not spoiled by IMDb from the get-go).
Speaking of "go," the haunting cover of "Our Lips are Sealed" by FUXA (originally by the Go-Go's https://www.youtube.com/watch?v=r3kQlzOi27M ) is very fitting; and equally witty pertaining to the twist-theme of the film...if it wasn't for IMDb spoiling it on the titlepage, as I have now repeated too many times.
Here's hoping that there's many more movies in this genre coming and that IMDb doesn't spoil them.