I'll bet! Was he present in the audience for the entire showing or did he only arrive at the end?
What format was the movie in? 3D? IMAX? HFR?
I'm not sure when Cameron slipped in, but he wasn't there when it started. He's done so many of these type things he's probably got it down to a science when he arrives. With the heavy rains last night I was thinking he might not show at all -- but the man came. Honorable.
The screening was in a theater labelled IMAX 3D... the screen wasn't huge though and never changed sizes so I guess it was Lie-max. Cameron said we had just seen it in Dolby Cinema (which he meant as a positive) and I do believe it was HFR at certain times; I did notice the change. Thankfully no headaches. Like the first Avatar, I kind of got used to the "3D" experience after a while and it only kept working when things were floating in front of you like ash or little fish.