From Dale Myers: "The death certificate "discrepancy" - as I noted in "With Malice" - was explained during a 1983 interview I conducted with the late Dr. Paul Moellenhoff, who attended Tippit at Methodist. He told me that the clocks within the emergency area at Methodist showed different times - neither of them accurate as it turns out.
"as it turns out" means that it just didn't agree with what Myers wanted to believe.
Interesting, huh? All this fuss because no one at Methodist bothered to synchronize the clocks to actual time (some running fast, some running slow).
What's also interesting is that Bowles said the same thing about the dispatcher clocks.