Question: So is the loophole used to get Chazz and Jimmy back into the figure skating arena actually in the Olympic Pairs skating rules somewhere?
Answer: It wasn't really a loopole in the rules of figure skating that they found. When the two were banned from figure skating, the board specified that the two were banned from singles skating. Therefore they would be able to skate as doubles, since it wasn't a general ban from figureskating as a whole. But no, doubles skating rules specify the pair must be a man and a woman.
Answer: The loophole isn't that they are a male-male team. The loophole is that the rules stated that a lifetime ban from the sport is only valid for the skaters division in which they were banned. So as long as they do pairs skating male-male or male-female, they can compete again, but all real competitions state that it has to be a male-female pair.
Question: So is the loophole used to get Chazz and Jimmy back into the figure skating arena actually in the Olympic Pairs skating rules somewhere?
Answer: No. International Skating Union regulations clearly states that the pair has to be a man and a woman.
That wasn't the loophole. The loophole was that a ban is only good for the division where the skater was banned. If they were banned in singles, they could still compete in pairs.
Answer: He is credited. In the beginning, the credits read Will Farrell, then Blades of Glory, and THEN Jon Heder shows up.