Question

Two last-minute problems in the American attack on Tokyo included: lack of nighttime hours not enough gas Japan unfolding the scheme

Answer 1

Not enough gas and the japenese unfolding the plan

Answer 2

The two problems are:
lack of nighttime hours
not enough gas
Lack of nighttime hours prevent the soldiers on the attack to fight on their prime condition, which make them feel overwhelmed during the battle.
The lack of gas was caused to the failing calculation that US made to predict the distance between the two countries at that time.