British and American accents

We have seen in class that there are some differences between British English (BrE) and American English (AmE). Eventhough both English and U.S. speakers understand eachother, there are differences not just in the vocabulary/lexicon they use, but also as far as accent is concerned. What conclusions can you draw from these two videos? British speaker imitating U.S. accent
<iframe width="640" height="360" src="http://www.youtube.com/embed/LpJ3yzUPbL0?feature=player_embedded" frameborder="0" allowfullscreen></iframe>
U.S. speaker imitating the British accent
<iframe width="400" height="360" src="http://www.youtube.com/embed/liNVaGWYHYc?feature=player_embedded" frameborder="0" allowfullscreen></iframe>

<iframe width="400" height="360" src="http://www.youtube.com/embed/uvpikUEIaLI?feature=player_embedded" frameborder="0" allowfullscreen></iframe>

And here you can see a very funny video from a classic British soap opera! I hope you enjoy it!

<iframe width="400" height="360" src="http://www.youtube.com/embed/H-oH-TELcLE?feature=player_embedded" frameborder="0" allowfullscreen></iframe>