Jess's team, Hounslow Harriers, is playing Queens Park Rangers (QPR) in the final. A woman wearing a QPR scarf is sitting behind the Harriers' bench and is seen cheering after Jules and Jess score goals against QPR.
In the match where Jess and Jules aren't getting along, Jules' hair is held back by a metal headband, except in one close-up where it is held back by a thick, black headband. It then goes back to the metal headband. Then in the final game Jules is wearing the black headband again.
At the very end when Jules and Jess are going to board the plane, they turn around and wave to their parents. Jules is at first shown waving with her right hand, but then in the next shot is seen waving with her left.
The speaker during the match which is supposed to be in Hamburg speaks German with an English accent and makes typical English errors (e.g. he says "... Elfmeter ausgeführt bei Nummer 7 Jess ..." instead of "... durch Nummer 7 ..." announcing the penalty)
The goof item below may give away important plot points.
About 105 minutes, Jess and Jules send sweatshirts and a photo of the Santa Clara University football team to their respective parents. Jess's sister Pinky appears at least 8 months pregnant, although its only been about 2 or 3 months (at the very most) since she was married. There is no way she could be that pregnant in such a short period of time; clearly a mistake.