Interview was meh

Just had my interview, felt pretty meh. Is it going to hurt me or will it be a non-factor? I don’t think I did anything that bad, just some of my answers weren’t very good and I thought of better ones as I was driving home.

Most likely interview will be factored in because why would they have interviewed you in the first place?
As Endora said, check out the latest CDS (Common Data Set) and (I think) D section, which will tell you whether they consider interview or not during admission evaluation.

You can check out collegedata.com, which will have all the CDS information posted, although it may be outdated.