Interview for Ad Operations job tomorrow - what can impress the company?

Hi there,

I have a final interview tomorrow for a fairly big London marketing agency company, and I was wondering if anyone has any tips.

Perhaps something you wish you knew when you started, or something left-field that people do not think of?

I come from an analytical English Linguistics degree background, and I understand the field of Ad Ops, but I'd like to know some inside info!

Thanks a lot!

Edit: thanks for all of you that commented, I think the interview went well and hopefully I'll be able to say I have the job early next week. Fingers crossed!