In office If possible don't escalate things. Appreciate in public and talk about shortcomings in private. This way you maintain healthy relations with your mates and then they work with a different zeal.
Make sure there is not requirement change from the client which is verbal, everything should be documented.
Assumptions can be fatal when it comes to requirements.
The moment you are out of the Airport remove the bag tags please, some people tend to keep it for months showing off that they just arrived from a flight. Me and my friends laugh at this a lot.