I'd have used less stock footage in first season
I know it saves money and time, but for anyone who's seen other films with that footage in, it's a problem.
So I'd have filmed some driving stuff instead of using chunks of 'The Italian Job' for Thief of Budapest, and I'd have filmed the handover of the coffin on the bridge instead of borrowing that scene from 'Funeral in Berlin' to use in Deathlock.