I think they're all examples of compliance - i.e., in each example he gets them to go along with something that isn't true. The creepy clown is the most obvious. He has put her in a confusing situation and then makes her confusion look like agreement. He also appears to be mirroring and then provoking her body language. He manages to get her to not walk away and to say he's right, but most of the time she appears to be completely baffled. With the pet name, I suspect the main part of the trick is making the man wait an extremely long time and making him sympathise with the woman, so that he'll agree with whatever she says. In his book he explicitly claims to never use camera tricks, he says it's always a mix of traditional magic and psychological techniques, with one sometimes posing as the other.