[nprecup]

Yes! I saw it at the 36 minute mark on the video. That had me curious. I think it was a trick of perspective, it first looked like some huge chunk of debris that the first stage flew past, but after watching it again, it looks like a little chunk of ice that got blown off of by the cold gas thrusters.

[Luc]

Yes, that's it, a few seconds after the 36 minutes mark. I think you're right, and it does look a lot smaller upon rewatching!