[SunTzuWu]

It sounds like he ran out of runway before he became an airplane.
Even if it's your 4th or 5th hop of the day, you NEVER skip your check list.

[Atchafalaya]

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overload/load placement; I assume the engine was making power because he continued his roll.

[Archangelsk]

I checked the weather for the greater Pittsburgh area, apparently it was warm (about 80 F) and Greensburg-Jennette (5G8), if I remember correctly, has a field elevation of 1188 and a runway length of 2600 feet. Combine those conditions with 5 crew and pax and you may have an overweight airplane for the field length.