While Hank and Walt are at the table after dinner, Hank's watch does not work.
The 30-day tag on Walter's new car expires on August 12, 2012; this episode is set in 2009, exactly one year after Walter White was introduced on his 50th birthday in 2008.
A big deal is made about the GPS tracker on the outside of the barrel being a bad location. In fact, if the tracker were inside, it would be completely shielded from the GPS satellites to calculate its location and the cellular network to report back to the person who placed it there.
Hank mentions "Highway Patrol" to Walt Jr. There is no "Highway Patrol" in New Mexico, it's the "State Police."