Contracts that lock in a waterfall process.
At last they were not trying to use agile!
At last they were not trying to use agile!
Another common pitfall seems to be engineering teams choosing agile when the business engagement model is waterfall. This puts you in the unfortunate situation of trying to change requirements without being able to get paid for those changes.
A nuclear power station built successfully using an Agile process would be something I'd like to read about.