Hello, Pete! Yes, that very brief clip is actually most of what aired from Sam's one and only television interview (Today show, NBC, 11/22/93). The other segment was merely about John Junior's salute.
Sam helped put the top on at Parkland with a Dallas police officer. The cleaning of the blood and gore appears to have been done (well, at least an attempt was made) by the other agent present, the infamous George W. Hickey, Jr. What's more, the bucket sitting there may or may not be related to any aborted attempt at cleaning, as it could have also been used for lubrication of the metal screws that fastened the metal strips for the bubble top.
As for Gary Loucks, I do not credit him. I was dubious from day one about this, as Sam (in three lengthy conversations from 1992-1994) never divulged this information.