cl_pdump
cl_pdump is a console variable available in all 
Source games.
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If you set the value of cl_pdump to a predicted entity's index (from the left-hand column of the cl_predictionlist window or cl_showents), then it will overlay a big list of all of the entity's predicted variables. Then you can run around and you will find out which variables the client is mispredicting. The variables change red when the client has mispredicted a command.
