I think it is imperative that the Production Manager goes through the time sheets with a representative of each department ‘face to face’ to discuss any discrepancies or issues that may arise. I don’t think it is good enough just to go through the sheets and ‘scrub’ out any overtime that might not seem correct with the Daily Wrap logs etc.
Hopefully all the overtime claimed will have be been properly sanctioned ahead of time but sometimes crew members have to work beyond the agreed period.
This can sometimes lead to lively (and sometimes, raucous) debate but in the long run it shows the human side of the Production Office and proper respect for the work that ALL Crew provide to make a film/ TV/ Short/ etc etc.
My second tip with regard to this policy is have a large baseball bat and protective head gear.