Apparently he wasn't actually drunk during those out-takes.

He'd been filming something else the day before, it overran and they filmed until almost dawn. So he had some sleeping pills so he'd be refreshed before filming the adverts.

Unfortunately, and probably not unrelated to the sheer size of the man, they kicked in just as he was scheduled to start filming.

So that's what you see. A man fucked up on barbiturates.