Looks like there were some bloopers during the demo: https://x.com/nearcyan/status/1968473003592990847

Huge respect to Zuck and co; I much rather authentic demos where stuff goes pear than some glossy marketing spiel by a non-technical exec.

Also, I didn't know this demo was taking place until afterwards, meta really should do more to publicise their demos, especially given they're actually making cool new stuff, unlike a lot of other big tech companies who are more about rent-seeking, advertising and enshitifying than inventing.