Did John Connally turn to his right and survey the crowd immediately after the first shot (which I believe occurred about 1.4 seconds before Zapruder resumed filming at Z-133)?
This is what he said in an interview:
[...] At that particular juncture the crowd was still very thick and very enthusiastic. It began to thin immediately after we turned onto Elm Street. We could look ahead and see that the crowd was beginning to thin along the banks, just east, I guess of the overpass ...
We had just made the turn, well, when I heard what I thought was a shot. I heard this noise which immediately took to be a rifle shot. I instinctively turned to my right because the sound appeared to come from over my right shoulder, so I turned to look back over my right shoulder, and I saw nothing unusual except just people in the crowd, but I did not catch the President in the corner of my eye, and I was interested, because once I heard the shot in my own mind I identified it as a rifle shot, and I immediately -- the only thought that crossed my mind was that this is an assassination attempt. So I looked, failing to see him, I was turning to look back over my left shoulder into the back seat, but I never got that far in my turn. I got about in the position I am in now facing you, looking a little bit to the left of center, and then I felt like someone had hit me in the back. [...]
[emphasis added]
The Zapruder film, frame-by-frame:
https://www.assassinationresearch.com/zfilm/-- MWT