It is just worth bearing in mind that if you dont fill in the I-94 correctly, they more often then not send you away to fill in a new one and you have to join the back of the queue. Seen it done many times but not had it happen to me yet.
It is also worth bearing in mind that some of the immigration people do not like people referring to their nationality as English/Welsh/Scottish. A friend of mine recanted a story of a discussion he had with an immigration officer as he did not like being called British. As spiney stated, most of them have a total sense of humour failure.