Instant Replay:Reviewing key plays Week 21

Gaven's PK, Ching's first goal and an alleged foul on Nakazawa
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This week's edition of Instant Replay looks at the following five plays:

1. Birahim Diop's opening goal in KC-NE, which the Revolution claimed was offside;

2. Eddie Gaven's disputed penalty kick which opened the scoring in CLB-COL;

3. Jason Garey's goal which was called back due to a very close offside in CLB-COL;

4. An alleged foul on Kyle Nakazawa which led to DC United's second goal in DC-PHI;

5. Brian Ching's opening goal in HOU-CHI which saw GK Sean Johnson fall hard to the ground.