Biff wasn't unconscious the whole time. When you look at the video store through Edna's binoculars, Biff is seen coming out of the store with a wrapped up video.
I wasn't aware of this. I must not have been paying too close attention to that part. Regardless, it explains why he never noticed the DeLorean. He was too busy.
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I wasn't aware of this. I must not have been paying too close attention to that part. Regardless, it explains why he never noticed the DeLorean. He was too busy.