Film4 tweeted a link today to their Clapperboard Montage video using the tweet below.  And that screencap is about how long Rob appears in the vid lol.
 
Here’s the vid.  Don’t blink or you might miss.  Rob is at about 0.17 but just so you make sure you don’t miss he’s after Jason Statham and before James Franco.
Thanks @sallyvg for the heads up.
Hang on, FILM4, that’s so unfair. Angelina Jolie features TWICE, and Rob gets a nanosecond appearance. WTF?????
The only good thing about it is that I got to rewatch Rob’s clap about 100 times – and it only took me a minute!
A nanosecond is right – I can tell you it’s 2 frames of that vid … TWO FRAMES! I can’t even make a proper gif of it.
OMG! Tooooo fast, but still kinda fun.
I have to say I fangirled a bit seeing Nick Cave in there too, then remembered the horrible tragedy faced by him and his family. My heart goes out to them