Eva Longoria appeared as a Super Club employee named Lily, in a scene filmed as an alternate opening deleted from the theatrical release. The scene is found in the "Special Features" section of the DVD.
After Zack makes fun of Vince when he asks if Amy's last name is Nordic, Vince says "Oh, he's quick with a joke or to light up your smoke," which is a line from Billy Joel's song, "Piano Man".
Dane Cook is a die hard Boston Red Sox fan. In the movie when Super Club is playing Maxi Mart in the baseball game. Super Club is Red (in honor of the Sox) and Maxi Mart is Gray and Blue (in honor of the Yankees). This is a play on the famous rivalry.
When Amy is first walking into Super Club her hair is blowing back and you can see her ears and they are normal size. Later in the movie we learn that Amy was born with over sized ears and when we see them they are really big.
When Russell is going to meet Lily to get Amy's file
he picks up one Butterfinger bar and breaks it,
but when he meets Lily he now has two Butterfinger bars.
When Amy is showing Zack her ears, she pulls her bangs to the back. She then covers them up again. In the next shot, we see her hair behind her ears, and in the next shot her hair is back in the front.