The Central Park Media translation of Kuwahara is actually a translation error, if the US translators had looked at the actual Japanese spelling of Kuwabara's name, they would have had it correct.
The back cover of the USA Central Park Media DVD says that Yusuke is in High school, but this is incorrect as he is 14 years old and is actually in Middle School.
At 18:13 in the English dub when Yusuke says that they need to split up and protect the other Elemental Sites his mouth has extra flaps without dialog which goes on for about 2 seconds.