The fact that they cancelled a flight due pax observation is concerning
The more observant the passengers the better and better still if they point it out to the crew.
Air Ontario 1363, F-28 crashed on take off in Canada due ice on wings. Dead heading Captain who observed same thought it improper to tell the operating crew how to go about their job. One passenger raised his concerns with a Flight Attendant who had her own concerns but previous interaction with tech crews prevented her expressing her concerns. 24 fatalities (21 pax 3 crew), 37 of the 45 survivors injured.
Aloha 243, a female pax boarding the aircraft noticed a crack in the fuselage skin near the entrance door, she made no mention of it in the belief that the airline knew what they were doing and that she would have been humoured and regarded with disdain if she made a fuss about it. 90 pax, 5 crew, 65 injured (8 serious), 1 fatality (FA).