Revealing mistake: When Will and Jon are doing their final skate and Will breaks his ankle and they have to switch position in the final routine, they are skating around getting ready to do it and Will lifts up his broken ankle so Jon can grab it. When he grabs the broken ankle, Will shows no sign of pain, but earlier when he tried to skate on it, he screamed in pain.
Blades of Glory (2007)
1 revealing mistake - chronological order
Starring: Will Ferrell, Will Arnett, Craig T. Nelson, Amy Poehler, William Fichtner, Jenna Fischer, Jon Heder
Factual error: Early in the movie we see the newspaper dated "Sunday, March 14, 1987". March 14, 1987 was a Saturday, not a Sunday.
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Answer: He is credited. In the beginning, the credits read Will Farrell, then Blades of Glory, and THEN Jon Heder shows up.