The British had wanted the Torch landings to include a landing in Tunisia instead of Morocco but the Americans were afraid of a German attack through Spain and into Morocco to cut the invaders off. Had the landings occured in Tunisia it would have wrapped up the North African front 4 months early.
Italy could have gone a lot better. Had the Italians blown their railways when they switched sides German reinforcement of southern Italy could have been significantly delayed leading to an earlier Allied advance. Combine this with the above early end to action in a Africa the allies could be on the Po by D-Day. Maybe breakthroughs into Austria, Hungary and Czechoslovakia
Landings in the Balkans instead of southern France would have probably led to a more favorable postwar environment thatis free Bulgaria and Romania.
Italy could have gone a lot better. Had the Italians blown their railways when they switched sides German reinforcement of southern Italy could have been significantly delayed leading to an earlier Allied advance. Combine this with the above early end to action in a Africa the allies could be on the Po by D-Day. Maybe breakthroughs into Austria, Hungary and Czechoslovakia
Landings in the Balkans instead of southern France would have probably led to a more favorable postwar environment thatis free Bulgaria and Romania.