Hi Hentaiboy,
From what you have said it does sound like a pirate copy. As a matter of interest how much did you pay for it. If you bought it £10 not bad. If you paid under £7 that very good-there's your guide.
the 10p comment, well unless you want to go flying around the world to get it cheaper than don't bother replying to people like that.
If it's under a tenner and your very happy with the picture quality, good luck to you. If you had a PC with a DVD drive you could check out the attributes of the film. i.e aspect ratio, bit rate, size of contents, size of actual film, etc.
Personally £7 is my max limit if the quality is perfect and that's around the price I paid for one summer of last year - well, well before a release anywhere. So it didn't have many extras. Now that it has been officially released everywhere you might, just might be able to find an original for a tenner ?? In which case I'd go for an original as there is not much price difference.
There are many on ebay , just need to be selective in buying a R2 DVD. Some post they are R2 DVD's when in fact they are multi-region version. Most would not be the wiser as it would play in any machine anyway !! There would be a very small risk in those situations where the picture may appear Black & White or in the case of Playstations, may not play at all.