They showed CCTV footage from across the street of the car That Floyd was loaded into. Their footage was choppy. Then when the defence came to cross examine the witness (911 woman who obsereved the footage live on the day) he played the version of the same footage he had on his own computer. It wasn't choppy at all, completely clear. Prosecution added the choppiness so people wouldn't see the car clearly shaking as Floyd violently writhed around in the back. The 911 responder had seen this on the day.