When Taj is proposing the challenge to Charlotte the close up shots of him show him facing straight on standing square, but the distance shots he is standing at about a 45 degree angle to her looking to the right to talk to her, not facing straight on to her.
Taj asks if the barn is red. The response is "No." He replies, "Well, it's not a barn, then." This is a reference to Dude, Where' My Car, in which the same line is used.