First here it is available on you tube.
But can a team actually switch drivers from one team to another (1970 or 2014 rules)? I am pretty sure that wouldn't be allowed, but I am not up on any rules, I just watch.
My thought was when team manager came in the trailer to tell Steve get ready to drive, "They can't do that, but maybe in 1970 they could"
Edited for clarification, driver switching from a team car # 20 to team car #22 to drive the last stint.