I know this is common in all sitcoms and it happens all the time, but I thought this was a good example of how they changed Tony's character as the show progressed.

In Season 5 episode 25 ("It's somebody's birthday") Tony wants to buy a van to replace the iconic blue rested one that we all know and love. So he's gushing over the van and Angela drags him into the kitchen to stop him from being so eager in front of the sales guy. Tony falls for cliches like the "I have someone else interested" tactic and acts like a 5 year old panicking that he won't get the last Popsicle from the freezer.

That doesn't really make sense, if this was from season 1 the whole situation would've been reversed. It would be a funny bit about Angela gushing over a new Jaguar with Tony coaching her about how to haggle. She would explain that this isn't "the streets of Brooklyn" and that they are in a high end dealership in Connecticut. In the end Tony would be right and she gets the car for a really good deal with a happy ending.