B737-800
Flight Crew Air Transport Pilot (ATP)
Distraction; Communication Breakdown
Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued Advisory / Alert; Air Traffic Control Issued New Clearance; Flight Crew Became Reoriented; Flight Crew Returned To Clearance
Human Factors
We missed the revised segment on our PDC giving us a different RNAV departure.  Loaded and flew the FTHLS 1 rnav departure but our PDC revised us to the LALUX 1 which has initial turn to northwest instead of southwest from a 25R departure.  No excuse but we got talking about the EDCT time and how the PDC had the words 'wheels in the well' on it.  Again; no excuse.  It was right there in front of us; plain as day.  I can't believe we missed it. ATC saw us heading southwest and vectored us back to the northwest. There was no other traffic involved or close by. From now on I will actually hold the pdc in my hand while doing the legs verification check just like I do the flight plan as a reminder to look at it more closely.
B737-800 Captain reports not detecting a SID change in the PDC; resulting in a track deviation on departure. ATC quickly detects and corrects the error.