I saw it too, the camera zoomed in on two plays like that. Yes, I'd like to say it's a "tell" too. But without seeing the whole field, it's hard to really say.
Anyhow, even if it is, I'm pretty impressed. I finished watching the Oakland game and Tukuafu was there, nothing too super impressive except his size and the potential havoc he could wreak. Against the Giants, he was much more effective and hit some REALLY nice blocks. One run up the left side in the 4th (I think it was) Lynch followed Tuk right through the hole. It was pretty awesome.
And, another impressive play, again don't recall when it happened, I think again the 4th, I-formation fake to Lynch and Lynch followed Tuk and Wilson circled to the right and gained some good yardage. Happened a lot and with defenses needing to focus so much on Lynch, and Lynch + Tuk, it was fairly easy pickings for Russell most of the night (I still wish he didn't have to run so much, but hey if it's there, it's there)