Good find! Yes, I suppose that any stunt or sequence involving some special skills is done by doubles.
I guess you know where Bryan Cranston is replaced with a stand-in during 'Rollerskates'? He did do a lot of it though.
I saw it in 'No Motorcycles' too. Bryan does a little bit riding 'his hog', but the rest and all of Chris is done by doubles.
A telltale sign is often when the characters keep their heads down behind a steering wheel, a car door or their faces are suddenly obscured in some other way.
They tightened security in S1, when Frankie suffered a concussion during a fight scene.
Rich