Depending on the DPE, he might want to follow up on the questions you missed because your (ground) instructor is supposed to sign off that you have been re-taught the materials in the deficient areas.
I brought up my 2 missed questions with the DPE and explained in one sentence why I missed them (I actually really missed one and it was an easy one too) and how I followed up and the DPE only nodded, he seemed okay with it.
But it really depends on your DPE, his flow, his mood, the day, your character ... too many variables.
The important thing is that if you know your stuff, the oral should not be a problem, no matter what score on the written.