When Dexter sees that Harrison got a job working for Kurt he says that his son working for the father of his last victim seems pretty dire. But his last victim was the drug manufacturer Jasper and not Kurt's son.
At 28:20 Dexter pulls out his phone and proceeds to use it even though it's upside down.
When Harrison begins the line "On my way up here from Florida" (around 32:35), his mouth doesn't match his words at all.