When they stop at the gas station and Walker gets a soda, he puts money in, but doesn't press any buttons. The soda still comes out.
When they stop at the gas station walker tells the gas station attendant 20 dollars worth of gas but when they realize their prisoner was escaping in the corvette and they ran to the truck the attendant didn't ask for the 20 dollars walker owed him even though the attendant didn't know they lost their prisoner or why they were in a hurry to leave.
Harris who is in the back of Walker's pick up truck escapes at the gas station and the Rangers go after him. Walker asks Trevette how did he escape? Very easy. Harris was only in handcuffs and not secured to the truck in anyway. They should have handcuffed him to the chrome roll bar in back. Great lawmen they are.
There is no reason why the Rangers should have to spend the night anywhere. It's only a 5-6 hour drive from Midland to Dallas.