When Bender is running thru the halls on his way to the gym, all the clocks are set at approximately 12:05. Then when he gets into the gymnasium, the clock reads 12:25. Unless Bender continued to run around for another 20 minutes, this was an obvious slip-up.
Well if one clock is 20 minutes fast, who to say there isn't another clock 20 minutes fast as well? Personally I always thought it was the Janitor who messed with the detention clock, he's the Eyes and Ears of the school, remember? So I don't think this could really be considered a slip up.
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