When Walter first stands up as the team awakens in the Central American bunker, his phone is clearly visible in his front-left pocket. Moments later, Cabe exclaims that the captors have taken their wallets and phones.
Cabe says Marines go through boot camp at Camp Pendleton. Although also located in San Diego, CA, Marines do not go through boot camp at Camp Pendleton but at Recruit Training Depot San Diego.
The gear selector is in park when Happy is driving the truck away from the bad guy.
Mixing counterfeit bills with currency printed by the U.S. Treasury does not devalue the dollar. The dollar has already been devalued when the U.S. Government decided that it not be backed by Gold and Silver. The actual U.S. dollar is worth only what people to believe it to be. In reality, it's only worth a few pennies. For a bunch of so called geniuses, they obviously don't know much about inflation.
In a 1992 flashback, Paige's mother pulled a wad of US currency from a mark's wallet, including a $20 bill with large "20" on the lower-right corner of reverse side. However, this security feature was first released in 1998.