He’s chomping on a carrot in the rain in the streets of Bree as the hobbits make their way to the Prancing Pony.
In The Two Towers:
He’s in armor, throwing a big rock down on on the uru-kai from above the gate at Helm’s Deep.
He’s barking orders on the deck of one of the black ships, wearing what looks to be quite the fashion statement of an outfit.
Heck, there may even be more, but I haven’t noticed any, and I’ve been lookin’…
I haven’t seen every last moment of “behind the scenes” footage on the DVD’s or other media, but darn close to it. Yet I have not heard the cameos mentioned, which (aside from my usual geeky curiosity) makes me wonder how many other folks have noticed them, and when they became aware of them.
For me, it was not untill I was watching my freshly purchased Two Towers dvd. Within a few days I saw Fellowship playing on cable and the lightbulb of realization over my head lit completely, though there had always (since my first giddy viewing) been something about the Fellowship scene that nagged at me. I just didn’t put my finger on it for a while.
When I saw Return… in the theater I had my eyes peeled for him, and pointed and squeeled at him to my friends, who couldn’t have cared less.