There are lots of Artifacts in many of the "Lost Bullet" Zapruder Frames.
I highlighted a couple of them a few years ago in these two consecutive frames, I think others did too, but there are many more in this same Gif example.

Thanks Duncan!
This is a perfect montage or sequence (Z-151 Z-152 and Z-153) for pondering these questions:
1) Why is Secret Service Agent Glenn Bennett leaning over so far to his right in the backseat of the follow-up car? (Remember, he said he heard what he thought was a firecracker and that he was looking at JFK when he was hit in the upper back / lower neck.)
2) Why is George Hickey opposite him leaning over so far and looking down at the pavement? (Hint: He's not looking at Phil Willis who's stepping into the street.)
Answer: They are both reacting to the sounds and sights of Oswald's first, missing-everything, shot at hypothetical Z- 124*, half a second before Zapruder resumed filming at Z-133.
*As indicated by the 2020 analysis by Roselle and Scearce of the nearly simultaneous non-startle reactions to the sounds of the shot by seven prime witnesses, including George Hickey and everyone in the limousine except for the driver.