When flight instructing / examining in GA, flying lots of different aircraft and several different clubs, each with their own checklists...

Before rolling, I used to ensure the student/candidate had tested the five things that could kill or seriously embarrass me. The other 87 items in the checklist I didn't worry about so much.

Controls F&F
Trim set
Flap set
Harnesses checked (both seat belt & radios)
Doors closed.

Can't claim credit though - I borrowed the list from someone else. :)

Misrigged
 

Many Years ago in NZ a DHC Beaver was Completely rebuilt then Attempted a T/O with Crossed Ailerons Result = Write Off + 2 injured people..! So Check Freedom of Controls Plus Correct Imputs..!

That Beaver crash occurred at Gisborne following a major overhaul of the airframe the pilot (HC) was in town from Masterton as his Beaver was on a 100 hour check and offered to do the test flight only to end up in Hospital for a few months he did return to fly another day.