Agreed Garage.
Other clues would have been
1. Pilots not wanting cabin crew up front. No coffee. No meals. Not even a chat.
2. Sky show on IFE. This could have been turned off.
3. Failure of the sun to rise in front of them.
4. SMS on their phones as they crossed land. Been a bit of a surprise for a telco to welcome them to Malaysia or Thailand when they should have been over water.
Expect pax were out of the picture fairly early on.