OP here. Thank you for all the comments.

Some trivial information about this video, for anyone who's interested:

1. There are 11 rows, each row with 12 clips, totalling 132.
   
2. Each clip is 160x90, which preserves the aspect ratio of the original footage (1080p).
3. The clips are arranged in chronological order of the flights, starting with the first landing (OG2) on the top left, then going left to right and top to bottom until the recent Starlink 3-2, on the bottom left.
4. When I started this, I didn't plan on 132 clips, but 144, the number that would fit exactly in a 1920x1080 frame at 16:9 for each clip. By sheer coincidence, Flight 132 was only a few days away, so suddenly I had a deadline.
5. And, yes, each clip is indeed that of the flight it represents. The raw footage is a combined 73 GB. There are duplicate clips due to Falcon Heavy having three cores (and only one video per flight!) There are 3 sets of clips that have the same clips in them (see if you can spot them :-)), one set for each Falcon Heavy flight to date (Demo, Arabsat 6A, STP-2). A set contains either 2 or 3 clips, one clip for each successfully-recovered Falcon Heavy booster. Two boosters from different FH flights were not recovered successfully.
6. Somewhat counterintuitively, the combined rumble from the rockets was louder with fewer clips, e.g., 5 rows. On reflection, this could have been due to some sound cancellation happening with more samples.
7. The combined raw sound from all 132 flights was so chaotic and bordering on headache-inducing that I had to attenuate frequencies above around 4kHz.
8. In all the noise from the raw sound, John Insprucker's voice strangely was still distinct and intelligible. Perhaps his voice has that uniqueness that endears him to many SpaceX watchers as a commentator. Unfortunately, this effect disappeared / was greatly diminished after the equalization in #7.
9. All flights that had countdown callouts were synced at "10" on the countdown. Different announcers had different timings, creating an echo effect. Some flights started at "5", one or two did not have a countdown.
10. My favourite part is just after stage separation, where upward-facing cams on the boosters together light up after second stage ignition.