There wasn't a whole lot going on in this leg. Well, not a whole lot that was production-related. If you happen to enjoy death glares, that's a separate thread...
Slap Using the buses. Come on: sending the teams on an eighteen-hour self-drive would have been fun. You can't tell me you haven't wanted to see that many Racers rounded up at the end. From Peru. (They could have done it. Don't ask me how, but with this crew...) The creation of three packs would have pretty much determined the second half in advance, but as it turned out -- not so much.
No hand movement Well, obviously they weren't on the first-class bus.
Clap The solar oven was a refinement on the dinosaur skeleton: same kind of construction challenge, but without the need to run back and forth every two pieces to check your model. And it still froze teams up for hours.
Slap You'd think they would have learned to predict Racer patterns based on past behaviors. Any time the teams have to deliver something on foot while working with an animal and have the option to do anything else, most of them are going to take Anything Else. That fire branch of the Detour was designed to be abandoned.
Slap Only the participants made that Roadblock anything close to difficult. Casting may have provided people who can't work basic division, but most of the planet would have only had trouble tracking moving cattle backs. And even that's not much of an issue once you realize they can't really shift in there and you're just accounting for wriggling. Once you've successfully ignored the auctioneer, it's over. Bad design overall, especially as it was the only thing to do in the city.