I think the blinking is visible. However I find the eyebrows and the hand to face gestures important. Also look out for uselessly long convincing statements. It is true that there is no moment to assess a baseline. However you can also count the potential red flags during certain subjects. More than 3 per sentence can indicate deception as well. Also take note of the context and does he show a lot of nervous gestures or body language cues? Then it will be a bit more tedious to find red flags.
I will look more closely in the future, right now I do not have the time for an in depth analyses.