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"I was really expecting to win, it was one of those matches I shouldn't have lost."
Ungracious, but probably true.
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"I could have won but I didn't do it."
True. He blew shots that he usually makes in those situations.
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"I was in total control for almost all the match"
Not exactly. But, neither was Canas in control. I think Federer considers himself in control as long the other guy isn't winning outright.
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"Statistics guys have no clue what an unforced error is"
Sour grapes
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"I have a feeling sometimes players play better against me than they would against other players"
Probably true. On the other hand sometimes players play worse against him for the same reasons. Either they feel they have no chance of winning or they believe they can win but have to play their best match to do it.