Given that there are 65 countries in the world that have made English their official language, between them there are bound to be some differences that crop up, take the UK and USA for example. Despite them being incredibly similar there are still a lot of noticeable differences between the two versions of english that they choose to use which can lead to some confusion at times.
Luckily however the US State Department have created a series of illustrated infographics that help make things a little clearer.