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The Supercharger is in the middle of a very high security construction site, but if Fremont is any indication, once the factory opens it's a possibility.
Those are shear studs, they are installed to secure the metal decking to the tops of the joists, trusses or steel beams.
They aid structural rigidity and allow greater mechanical attachment for the yet to be poured concrete.
Studs are attached with through-deck welding.
This type of structural system is called composite construction, with all the steel being in tension, excellent structural solution for long-span construction.
I grabbed this from TEG's post on Oct. 30, 2014.
Cowboy Stadium (only thing I can relate equivalent size to) is about 1/4 mile from end of truss to end of truss, so Gigafactory building is over 3/4 mile long, probably over 1/4 mile wide.