What behaviors are you speaking of? I've only watched the Dog Whisperer a few times.
Colby has the tendency to bark like a banshee when he first gets into the car. He's not mad, he's just super excited. Once he settles down, he loves riding in the car. When I consulted a trainer, (a trainer who idolized Cesar and even had a pic of the 2 of them in his office), I was not happy with the way he wanted me to treat Colby. He said something along the lines of me being too nice to Colby and treating him like a person.
Needless to say, I didn't go back after 2 sessions as I wasn't willing to be as "strict" (in my opinion, mean), as he wanted me to be. Colby didn't seem to respond to it either. I have a hard time thinking my dog would be happier if I used a choke collar on him and used a hateful tone.
Now you've hit on one of my favorite subjects.
When a dog is in an excited state, you, as the alpha, need to
remain calm and confident, first of all. You can allow the dog to do what you want the dog to do, but you must require the dog not do what you don't want to allow, and you can accomplish this without having to cause the dog any pain.
I would practice going to the car with the dog on a leash, stop at the car door, make the dog sit, open the car door, keep the dog out of the car until he displays a calm and submissive state, then invite the dog to enter the car. Practice, practice, practice. The dog will get it. If you let him get in the car while he's still excited, you will be positively reinforcing that excited state. You might even walk the dog first and make sure he is exercised, before attempting the car exercise. That way, his excess energy will be spent and he will be more submissive and pay more attention. When you walk the dog, don't let the dog lead you, you are the pack leader. Hold the leash to your side, only allowing the dog as little slack as necessary for him to walk beside you, not ahead of you, and you need to walk with your head up, chest out, focused ahead, as if you expect the dog to follow your lead and your confidence. Dogs understand what that means and it may take practice, but that's one of the first steps we take in making sure a dog understands their position and ours in a pack.
Remember, if you watch a pack closely, you will notice that, first of all, the alpha dog is ALWAYS calm and confident. I would recommend you watch The Dog Whisperer if you are able to. In my opinion, Cesar is terrible at actually explaining or verbalizing what he is doing, but watch closely how he does it and what he does. He really does understand the silent body language type communication that dogs have. I have learned a lot from watching him.