When the real Duncan is kicking the field goals look at the goal posts and notice the old rusty one and the new pretty one.
At the start of the Knowledge Bowl's "Lightning Round", Higgins High trails St. Peter Catholic School, 175-205. During the final round, Higgins gets two correct answers, while St. Peter answers one right. However, the score is tied 205-all at the end of the game. Assuming each question is worth 15 points, Higgins should've lost, 205-220.
When Blade is taking Duncan's glasses off and giving him the gold tooth to put in his mouth, the camera switches to Blade taking the tooth out then back to Duncan saying "that's not hygienic" with the gold tooth already in his mouth.